Repacked APKs are a common vector for trojans, adware, and data stealers. Security scans of similar mod sites have found spy modules that read SMS, contacts, and even banking info.
: Code injection may occur to remove license verification checks, bypass regional restrictions, or unlock in-app store items.
The "repacker" modifies the code. This could mean changing a boolean value from false to true to trick the app into thinking a premium subscription is active, removing advertisement SDKs, or injecting custom code.
Downloading APKs from third-party sources can expose devices to malware and other security threats. Users should ensure they have robust antivirus software and only download from trusted sources.