Uninstall the app immediately, run an antivirus scan (Malwarebytes or Kaspersky), and change your PUBG/Facebook password.
Stay safe on the battlegrounds, and play fair! mk tool pubg download
Before proceeding, it is crucial to understand that MK Tool is a third-party modification tool (a cheat/hack). Using such software violates the Terms of Service of PUBG Mobile . Uninstall the app immediately, run an antivirus scan