Run strings preview.jpg to look for readable text hidden in the binary code.
Use the file command in Linux or a tool like TrID to confirm the file is actually a RAR archive and not a renamed extension (e.g., a JPEG with a .rar extension).
Searching for these keywords often leads to a specific Japanese "Idol" or "Candy" themed blog or a social media profile (Twitter/X or Instagram).
Use binwalk -e preview.jpg to see if another file (like a .txt or .zip ) is embedded inside the image.
The password is frequently the date of birth or the handle of the individual featured in the "preview" image associated with the archive.
