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/s3/j.java

@@ -0,0 +1,69 @@
+package s3;
+
+import java.io.IOException;
+import kotlin.Unit;
+import kotlin.jvm.functions.Function2;
+import kotlin.jvm.internal.Lambda;
+import kotlin.jvm.internal.Ref;
+import r3.C;
+
+/* loaded from: classes3.dex */
+public final class j extends Lambda implements Function2 {
+
+    /* renamed from: a, reason: collision with root package name */
+    public final /* synthetic */ Ref.BooleanRef f8496a;
+
+    /* renamed from: b, reason: collision with root package name */
+    public final /* synthetic */ long f8497b;
+
+    /* renamed from: c, reason: collision with root package name */
+    public final /* synthetic */ Ref.LongRef f8498c;
+
+    /* renamed from: d, reason: collision with root package name */
+    public final /* synthetic */ C f8499d;
+
+    /* renamed from: e, reason: collision with root package name */
+    public final /* synthetic */ Ref.LongRef f8500e;
+
+    /* renamed from: f, reason: collision with root package name */
+    public final /* synthetic */ Ref.LongRef f8501f;
+
+    /* JADX WARN: 'super' call moved to the top of the method (can break code semantics) */
+    public j(Ref.BooleanRef booleanRef, long j4, Ref.LongRef longRef, C c4, Ref.LongRef longRef2, Ref.LongRef longRef3) {
+        super(2);
+        this.f8496a = booleanRef;
+        this.f8497b = j4;
+        this.f8498c = longRef;
+        this.f8499d = c4;
+        this.f8500e = longRef2;
+        this.f8501f = longRef3;
+    }
+
+    @Override // kotlin.jvm.functions.Function2
+    public final Object invoke(Object obj, Object obj2) {
+        int intValue = ((Number) obj).intValue();
+        long longValue = ((Number) obj2).longValue();
+        if (intValue == 1) {
+            Ref.BooleanRef booleanRef = this.f8496a;
+            if (booleanRef.element) {
+                throw new IOException("bad zip: zip64 extra repeated");
+            }
+            booleanRef.element = true;
+            if (longValue < this.f8497b) {
+                throw new IOException("bad zip: zip64 extra too short");
+            }
+            Ref.LongRef longRef = this.f8498c;
+            long j4 = longRef.element;
+            C c4 = this.f8499d;
+            if (j4 == 4294967295L) {
+                j4 = c4.O();
+            }
+            longRef.element = j4;
+            Ref.LongRef longRef2 = this.f8500e;
+            longRef2.element = longRef2.element == 4294967295L ? c4.O() : 0L;
+            Ref.LongRef longRef3 = this.f8501f;
+            longRef3.element = longRef3.element == 4294967295L ? c4.O() : 0L;
+        }
+        return Unit.INSTANCE;
+    }
+}