But to give you a about investigating a CloudFront subdomain like this: Story: The Case of the Phantom CDN
Sometimes attackers register dead CloudFront subdomains for domain fronting or C2, but here, the domain was never registered. However, Alex used nslookup to see if any CNAME records pointed to it — none. CloudFront’s TLS certificate check also failed. dnrweqffuwjtx cloudfront
It looks like the string "dnrweqffuwjtx.cloudfront.net" resembles a generic Amazon CloudFront domain name (randomly generated prefix + .cloudfront.net ). However, that specific subdomain likely doesn’t exist or has been deleted — CloudFront distributions are typically longer, and this looks like random keystrokes or a placeholder. But to give you a about investigating a
Alex searched logs and saw the query originated from a legacy Node.js script that had hardcoded a CloudFront URL — but the real one was dnrweqffuwj**s**tx.cloudfront.net . A single character off. The script kept retrying, generating noise. It looks like the string "dnrweqffuwjtx