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/kotlinx/coroutines/ChildJob.java

@@ -0,0 +1,43 @@
+package kotlinx.coroutines;
+
+import kotlin.Deprecated;
+import kotlin.DeprecationLevel;
+import kotlin.Metadata;
+import kotlin.coroutines.CoroutineContext;
+import kotlin.jvm.functions.Function2;
+import kotlinx.coroutines.Job;
+
+@Deprecated(level = DeprecationLevel.ERROR, message = "This is internal API and may be removed in the future releases")
+@InternalCoroutinesApi
+@Metadata(d1 = {"\u0000\u0016\n\u0002\u0018\u0002\n\u0002\u0018\u0002\n\u0000\n\u0002\u0010\u0002\n\u0000\n\u0002\u0018\u0002\n\u0000\bg\u0018\u00002\u00020\u0001J\u0010\u0010\u0002\u001a\u00020\u00032\u0006\u0010\u0004\u001a\u00020\u0005H'¨\u0006\u0006"}, d2 = {"Lkotlinx/coroutines/ChildJob;", "Lkotlinx/coroutines/Job;", "parentCancelled", "", "parentJob", "Lkotlinx/coroutines/ParentJob;", "kotlinx-coroutines-core"}, k = 1, mv = {1, 9, 0}, xi = 48)
+/* loaded from: classes3.dex */
+public interface ChildJob extends Job {
+
+    @Metadata(k = 3, mv = {1, 9, 0}, xi = 48)
+    /* loaded from: classes3.dex */
+    public static final class DefaultImpls {
+        public static <R> R fold(ChildJob childJob, R r4, Function2<? super R, ? super CoroutineContext.Element, ? extends R> function2) {
+            return (R) Job.DefaultImpls.fold(childJob, r4, function2);
+        }
+
+        public static <E extends CoroutineContext.Element> E get(ChildJob childJob, CoroutineContext.Key<E> key) {
+            return (E) Job.DefaultImpls.get(childJob, key);
+        }
+
+        public static CoroutineContext minusKey(ChildJob childJob, CoroutineContext.Key<?> key) {
+            return Job.DefaultImpls.minusKey(childJob, key);
+        }
+
+        public static CoroutineContext plus(ChildJob childJob, CoroutineContext coroutineContext) {
+            return Job.DefaultImpls.plus(childJob, coroutineContext);
+        }
+
+        @Deprecated(level = DeprecationLevel.ERROR, message = "Operator '+' on two Job objects is meaningless. Job is a coroutine context element and `+` is a set-sum operator for coroutine contexts. The job to the right of `+` just replaces the job the left of `+`.")
+        public static Job plus(ChildJob childJob, Job job) {
+            return Job.DefaultImpls.plus((Job) childJob, job);
+        }
+    }
+
+    @InternalCoroutinesApi
+    void parentCancelled(ParentJob parentJob);
+}