The postal letters, dated to 12 November, claim to be offering people in the country a new weather app developed by the country's meteorological agency, however they contain a QR code redirecting people to a malicious application developed by fraudsters.
Kudos for the unique delivery method, I guess?
(Also I do not like this sudden appearance of QR codes in daily life like for menus and shit for exactly this reason: just give me a URL if you must, or print something out and stop being cheap.)