If your OBB file is in .zip or .rar format, extract it using ZArchiver. You should end up with a folder named: com.wwe.wwemobile15
The long answer: WWE 2K15 on Android was a monumental achievement in 2014. It offered console-like graphics and deep match types on a touchscreen. However, due to Android’s evolving security architecture (Scoped Storage) and the game’s abandonment by 2K, the installation process is now fraught with errors, permission issues, and crashes. Wwe 2k15 For Android Apk - Obb