Primer paso de la investigacion. Se aportan el .apk, las carpetas con el apk extraido y el apk descompilado. El archivo API_DOCUMENTATION.md es un archivo donde se anotaran los descubrimientos del funcionamiento de la API, y los .py son scripts para probar la funcionalidad de la API con los métodos que vayamos encontrando. Finalmente, los archivos .js son scripts de Frida para extraer informacion de la APP durante la ejecucion.

apk_decompiled/sources/kotlin/reflect/full/KAnnotatedElements.java

@@ -0,0 +1,108 @@
+package kotlin.reflect.full;
+
+import java.lang.annotation.Annotation;
+import java.util.Iterator;
+import java.util.List;
+import kotlin.ExperimentalStdlibApi;
+import kotlin.Metadata;
+import kotlin.SinceKotlin;
+import kotlin.WasExperimental;
+import kotlin.collections.ArraysKt;
+import kotlin.collections.CollectionsKt;
+import kotlin.jvm.JvmClassMappingKt;
+import kotlin.jvm.JvmName;
+import kotlin.jvm.internal.Intrinsics;
+import kotlin.jvm.internal.Reflection;
+import kotlin.jvm.internal.SourceDebugExtension;
+import kotlin.reflect.KAnnotatedElement;
+import kotlin.reflect.KClass;
+
+@Metadata(d1 = {"\u0000\"\n\u0002\b\u0002\n\u0002\u0010\u001b\n\u0002\u0018\u0002\n\u0002\b\u0002\n\u0002\u0010 \n\u0000\n\u0002\u0018\u0002\n\u0000\n\u0002\u0010\u000b\n\u0000\u001a \u0010\u0000\u001a\u0004\u0018\u0001H\u0001\"\n\b\u0000\u0010\u0001\u0018\u0001*\u00020\u0002*\u00020\u0003H\u0087\b¢\u0006\u0002\u0010\u0004\u001a\u001f\u0010\u0005\u001a\b\u0012\u0004\u0012\u0002H\u00010\u0006\"\n\b\u0000\u0010\u0001\u0018\u0001*\u00020\u0002*\u00020\u0003H\u0087\b\u001a*\u0010\u0005\u001a\b\u0012\u0004\u0012\u0002H\u00010\u0006\"\b\b\u0000\u0010\u0001*\u00020\u0002*\u00020\u00032\f\u0010\u0007\u001a\b\u0012\u0004\u0012\u0002H\u00010\bH\u0007\u001a\u0019\u0010\t\u001a\u00020\n\"\n\b\u0000\u0010\u0001\u0018\u0001*\u00020\u0002*\u00020\u0003H\u0087\b¨\u0006\u000b"}, d2 = {"findAnnotation", "T", "", "Lkotlin/reflect/KAnnotatedElement;", "(Lkotlin/reflect/KAnnotatedElement;)Ljava/lang/annotation/Annotation;", "findAnnotations", "", "klass", "Lkotlin/reflect/KClass;", "hasAnnotation", "", "kotlin-reflection"}, k = 2, mv = {1, 9, 0}, xi = 48)
+@JvmName(name = "KAnnotatedElements")
+@SourceDebugExtension({"SMAP\nKAnnotatedElements.kt\nKotlin\n*S Kotlin\n*F\n+ 1 KAnnotatedElements.kt\nkotlin/reflect/full/KAnnotatedElements\n+ 2 _Collections.kt\nkotlin/collections/CollectionsKt___CollectionsKt\n*L\n1#1,102:1\n20#1:105\n288#2,2:103\n288#2,2:106\n288#2,2:108\n*S KotlinDebug\n*F\n+ 1 KAnnotatedElements.kt\nkotlin/reflect/full/KAnnotatedElements\n*L\n29#1:105\n20#1:103,2\n29#1:106,2\n62#1:108,2\n*E\n"})
+/* loaded from: classes3.dex */
+public final class KAnnotatedElements {
+    @SinceKotlin(version = "1.1")
+    public static final /* synthetic */ <T extends Annotation> T findAnnotation(KAnnotatedElement kAnnotatedElement) {
+        Object obj;
+        Intrinsics.checkNotNullParameter(kAnnotatedElement, "<this>");
+        Iterator<T> it = kAnnotatedElement.getAnnotations().iterator();
+        while (true) {
+            if (!it.hasNext()) {
+                obj = null;
+                break;
+            }
+            obj = it.next();
+            Annotation annotation = (Annotation) obj;
+            Intrinsics.reifiedOperationMarker(3, "T");
+            if (annotation != null) {
+                break;
+            }
+        }
+        Intrinsics.reifiedOperationMarker(1, "T?");
+        return (T) obj;
+    }
+
+    @SinceKotlin(version = "1.7")
+    @WasExperimental(markerClass = {ExperimentalStdlibApi.class})
+    public static final /* synthetic */ <T extends Annotation> List<T> findAnnotations(KAnnotatedElement kAnnotatedElement) {
+        Intrinsics.checkNotNullParameter(kAnnotatedElement, "<this>");
+        Intrinsics.reifiedOperationMarker(4, "T");
+        return findAnnotations(kAnnotatedElement, Reflection.getOrCreateKotlinClass(Annotation.class));
+    }
+
+    @SinceKotlin(version = "1.4")
+    @WasExperimental(markerClass = {ExperimentalStdlibApi.class})
+    public static final /* synthetic */ <T extends Annotation> boolean hasAnnotation(KAnnotatedElement kAnnotatedElement) {
+        Object obj;
+        Intrinsics.checkNotNullParameter(kAnnotatedElement, "<this>");
+        Iterator<T> it = kAnnotatedElement.getAnnotations().iterator();
+        while (true) {
+            if (!it.hasNext()) {
+                obj = null;
+                break;
+            }
+            obj = it.next();
+            Annotation annotation = (Annotation) obj;
+            Intrinsics.reifiedOperationMarker(3, "T");
+            if (annotation != null) {
+                break;
+            }
+        }
+        Intrinsics.reifiedOperationMarker(1, "T?");
+        return ((Annotation) obj) != null;
+    }
+
+    @SinceKotlin(version = "1.7")
+    @WasExperimental(markerClass = {ExperimentalStdlibApi.class})
+    public static final <T extends Annotation> List<T> findAnnotations(KAnnotatedElement kAnnotatedElement, KClass<T> klass) {
+        Object obj;
+        Intrinsics.checkNotNullParameter(kAnnotatedElement, "<this>");
+        Intrinsics.checkNotNullParameter(klass, "klass");
+        List<T> filterIsInstance = CollectionsKt.filterIsInstance(kAnnotatedElement.getAnnotations(), JvmClassMappingKt.getJavaClass((KClass) klass));
+        if (!filterIsInstance.isEmpty()) {
+            return filterIsInstance;
+        }
+        Class<? extends Annotation> loadRepeatableContainer = Java8RepeatableContainerLoader.INSTANCE.loadRepeatableContainer(JvmClassMappingKt.getJavaClass((KClass) klass));
+        if (loadRepeatableContainer != null) {
+            Iterator<T> it = kAnnotatedElement.getAnnotations().iterator();
+            while (true) {
+                if (!it.hasNext()) {
+                    obj = null;
+                    break;
+                }
+                obj = it.next();
+                if (Intrinsics.areEqual(JvmClassMappingKt.getJavaClass(JvmClassMappingKt.getAnnotationClass((Annotation) obj)), loadRepeatableContainer)) {
+                    break;
+                }
+            }
+            Annotation annotation = (Annotation) obj;
+            if (annotation != null) {
+                Object invoke = annotation.getClass().getMethod("value", new Class[0]).invoke(annotation, new Object[0]);
+                Intrinsics.checkNotNull(invoke, "null cannot be cast to non-null type kotlin.Array<T of kotlin.reflect.full.KAnnotatedElements.findAnnotations>");
+                return ArraysKt.asList((Annotation[]) invoke);
+            }
+        }
+        return CollectionsKt.emptyList();
+    }
+}