"AMZN" stands for Amazon Prime Video, the official streaming platform for the movie. "WEB-DL" means the file was directly downloaded (lossless rip) from the streaming service, bypassing re-encoding degradation.
Directed by Rahul Sadasivan and starring Revathi and Shane Nigam, this film is widely considered one of the best Indian horror movies of recent years.
The phrase seems to be related to a movie or a video file, possibly a Malayalam film titled "Bhoothakaalam" released in 2022. Here's some information: