Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1687a9a99af3b15…

MALICIOUS

PDF

58.6 KB Created: 2020-11-10 07:03:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 987f3c3f07d35a75d0c61279a6039cd5 SHA-1: 95c86ff6451dfef6c74e4b0c1b0bf83e070003bc SHA-256: c1687a9a99af3b1538e92f2bb7dbe54645dd98454a296d70eee2001f509b8233
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users to malicious sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The primary malicious URL identified is 'https://cctraff.ru/strik?keyword=critical+ops+latest+apk', which is likely used to distribute malware or phishing content. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7380

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?keyword=critical+ops+latest+apk
    • https://cdn-cms.f-static.net/uploads/4386852/normal_5f9540fc68b90.pdf
    • https://cdn-cms.f-static.net/uploads/4388178/normal_5f95784be6b69.pdf
    • https://cdn-cms.f-static.net/uploads/4374520/normal_5f95240657496.pdf
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5f95caad95981.pdf
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f88f9f33d7e7.pdf
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5fa9d66e10f34.pdf
    • https://disavapiviloma.weebly.com/uploads/1/3/4/3/134351159/6414213.pdf
    • https://cdn-cms.f-static.net/uploads/4388627/normal_5f95efef9b647.pdf
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/tekazu_niwudet_xikogotedu.pdf
    • https://uploads.strikinglycdn.com/files/dbccabe8-5369-47cf-9c20-61df5f9524d0/worms_3_apk_free_download.pdf
    • https://uploads.strikinglycdn.com/files/05f7f82b-bc94-4b77-87ff-9709eed452d1/daxajot.pdf
    • https://uploads.strikinglycdn.com/files/62a37dcc-7b86-431e-a638-1dcd9faf8444/jewelry_making_beading_for_dummies.pdf
    • https://uploads.strikinglycdn.com/files/4db0b9f8-fba9-4080-8612-87951631896a/rutefed.pdf
    • https://uploads.strikinglycdn.com/files/a7ec41d6-4b86-44f1-a425-293cf64aaade/rekoxeninixuvawewiwoxeb.pdf
    • https://uploads.strikinglycdn.com/files/54984eae-bc97-4cc7-962b-d7f540a54660/75918525799.pdf
    • https://uploads.strikinglycdn.com/files/a1cc8a51-f1c3-4747-8e4f-2dfbfaebcb25/31055319977.pdf
    • https://uploads.strikinglycdn.com/files/2a38e860-f329-4f69-a30c-a937eff2c8d6/nukomeve.pdf
    • https://uploads.strikinglycdn.com/files/d224a038-5955-4851-8840-5fec60d1265e/95405609484.pdf