arbitrobo[.]com

Analysis of arbitrobo.com, observed as offline as of the report date, shows a set of observable indicators that align with malicious phishing activity. The domain was registered on May 04, 2025 through GMO Internet Group, Inc. d/b/a Onamae.com and resolves to the Cloudflare address 104.21.16.1, which is associated with AS13335 in the United States. The TLS certificate presented for the host is identified as WE1, but no additional validation details are provided. The site’s HTTP response returns the page title “Just a moment…”, a generic placeholder that offers no insight into the underlying content.

Reputation scoring from Gridinsoft assigns a trust score of 0 out of 100, indicating a completely untrusted classification. The domain appears on a single security blocklist and is actively blocked by the PhishDestroy service. In the threat‑intel community, AlienVault OTX references the domain in one pulse, and VirusTotal records a single detection out of 93 scanning engines, confirming at least one vendor has flagged it as malicious. The limited detection footprint suggests the site may have been short‑lived or quickly taken down, which is consistent with the current offline status.

Because the available evidence points to a phishing‑related infrastructure, defenders should add arbitrobo.com to deny‑list rules across web proxies, DNS filters, and endpoint protection suites. Continuous monitoring of the associated IP address 104.21.16.1 is advised, as Cloudflare hosts many unrelated services, but abuse can be recycled to new malicious domains. Organizations should also consider querying their internal logs for any historic connections to this domain or its IP before the takedown, as compromised credentials may have been harvested during its brief operation. Until further forensic data becomes available, the prudent stance is to treat arbitrobo.com as malicious and to block all traffic to it.