Comment on the hashtag on the topic with the quest, which turned out to be the advertisement of the book:

ArbuzzzZ
The only similar thing I’ve encountered before is when a friend sent me a word with an image that had a link to the dropbox, where there was a qr-code with a link to Yandex.Disk with an archive with a txt-file that had a link to YouTube, which opened a three-second video on which this same friend was taking a screenshot printing, where in Word was written a pair schedule for tomorrow, which I had him, in fact, and asked...