Do not trust random APK download sites promising a standalone “Mortal Kombat Trilogy” app. Instead, we recommend the legal, safe, and superior method: emulation.
If the emulator setup sounds like a hassle, consider the official Mortal Kombat games on Android:
Neither feels like MKT, but they won’t infect your phone with malware.
Instead of a shady APK, download DuckStation (official from Google Play) and find your own PS1 ROM from a trusted preservation site (using a VPN for privacy).