Neither of these methods requires a sketchy file.
Because Rockstar does not host these files, they live on shady third-party file hosts (Mediafire, MegaUp, Google Drive links with broken CAPTCHAs). The "1.8 GB OBB" could be: Gta 5 Android Obb Zip 1.8 Gb -
Yet, if you type into a search engine, you are met with thousands of results, YouTube tutorials, and forum threads. This has created a mythical status in the mobile gaming community. Neither of these methods requires a sketchy file