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/r3/t.java

@@ -0,0 +1,84 @@
+package r3;
+
+import java.io.Closeable;
+import java.io.RandomAccessFile;
+import java.util.concurrent.locks.ReentrantLock;
+import kotlin.Unit;
+import kotlin.jvm.internal.Intrinsics;
+
+/* loaded from: classes3.dex */
+public final class t implements Closeable {
+
+    /* renamed from: a, reason: collision with root package name */
+    public boolean f8311a;
+
+    /* renamed from: b, reason: collision with root package name */
+    public int f8312b;
+
+    /* renamed from: c, reason: collision with root package name */
+    public final ReentrantLock f8313c;
+
+    /* renamed from: d, reason: collision with root package name */
+    public final RandomAccessFile f8314d;
+
+    public t(RandomAccessFile randomAccessFile) {
+        Intrinsics.checkNotNullParameter(randomAccessFile, "randomAccessFile");
+        this.f8313c = new ReentrantLock();
+        this.f8314d = randomAccessFile;
+    }
+
+    @Override // java.io.Closeable, java.lang.AutoCloseable
+    public final void close() {
+        ReentrantLock reentrantLock = this.f8313c;
+        reentrantLock.lock();
+        try {
+            if (this.f8311a) {
+                return;
+            }
+            this.f8311a = true;
+            if (this.f8312b != 0) {
+                return;
+            }
+            Unit unit = Unit.INSTANCE;
+            synchronized (this) {
+                this.f8314d.close();
+            }
+        } finally {
+            reentrantLock.unlock();
+        }
+    }
+
+    public final long d() {
+        long length;
+        ReentrantLock reentrantLock = this.f8313c;
+        reentrantLock.lock();
+        try {
+            if (this.f8311a) {
+                throw new IllegalStateException("closed");
+            }
+            Unit unit = Unit.INSTANCE;
+            synchronized (this) {
+                length = this.f8314d.length();
+            }
+            return length;
+        } finally {
+            reentrantLock.unlock();
+        }
+    }
+
+    public final C0580l e(long j4) {
+        ReentrantLock reentrantLock = this.f8313c;
+        reentrantLock.lock();
+        try {
+            if (this.f8311a) {
+                throw new IllegalStateException("closed");
+            }
+            this.f8312b++;
+            reentrantLock.unlock();
+            return new C0580l(this, j4);
+        } catch (Throwable th) {
+            reentrantLock.unlock();
+            throw th;
+        }
+    }
+}