The "WA" prefix typically identifies files saved or received via WhatsApp Messenger .
Images sent through messaging apps like WhatsApp are often heavily compressed to save data. This can result in "artifacting" (visible blocks or blurriness), especially in detailed areas like skin or textures.
Be cautious when downloading files with this naming convention from unknown sources. Generic image filenames are sometimes used in adware or phishing scams to urge users to click malicious links.