This site appears to be an image avatar CDN, like the kind a bank might use to serve profile pictures. The name includes "tinkoff," a well-known Russian bank, but that alone doesn’t make it trustworthy. The big issue is the hosting network: it’s on Spamhaus’s list of networks that are entirely malicious. That’s a strong signal that the hosting provider is abusing the internet, and any site on that network carries extra risk.
Without any way to confirm who runs this subdomain or see a history of its use, you’re essentially trusting a name in the URL. For a service that delivers content to your browser, that’s not enough. If you’re wondering whether pulse-image-avatar.cdn-tinkoff.ru is a scam or fake, the safest answer is: treat it as unverified. Stick to direct access through Tinkoff’s official channels instead.