While iTunes (Apple Music) moved to streaming, Amazon Music and Google Play Music (now YouTube Music) still allow purchases of specific tracks.
When searching for new Malayalam songs download MP3, you will encounter two types of websites: legal/streaming platforms and illegal piracy sites.
Gaana has one of the deepest Malayalam music libraries. Their “Malayalam Top 50” and “New Releases” sections are updated weekly.
If you want a true, portable MP3 file, use a desktop computer: