This domain is a subdomain of okcdn.ru, likely part of a content delivery network used to serve images, scripts, or other static files. When you access it directly, you get a 400 error — that's not unusual for these systems. They expect specific request paths or headers from an app or website, not a casual browser visit.
So is vd523.okcdn.ru a scam? There's no evidence of that. The site has valid HTTPS, no malware flags, and isn't on any blacklists. But it also has no public face — no contact info, no legal pages, no social media. That's fine for a backend service. If you're a developer embedding resources from this domain, the security signals are good. If you're a consumer wondering whether to trust it, the question is less about the domain itself and more about the app or site that uses it. Check the parent service first. For now, this domain is a safe infrastructure component with no trust red flags.