Malicious PDF — malware analysis report

Static analysis result for SHA-256 935fc1c175bb3dc7…

MALICIOUS

PDF

43.7 KB Created: 2018-11-30 20:34:11 +03:00 Authoring application: - (via Acrobat PDFWriter 3.02 for Windows NT)
MD5: cb6978616a2c2eaa2c5e5a72468c1864 SHA-1: 685f7b6736bef5e0b1f1211f40c2575e0d12e33e SHA-256: 935fc1c175bb3dc7dac17a1aeaf54bc48b56fa6fb7e552e78b6babf05e0f2e51
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment

The PDF contains a large number of embedded URLs, forming a link farm. This suggests a social engineering tactic to direct users to a website that may host malicious content or phishing pages. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9171

Heuristics 2

  • 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.
  • 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 http://www.gorillawalker.com/memphis-intrigue-1940-detective-murder-mystery.pdf
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    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://www.aiim.org/pdfa/ns/extension/
    • http://www.aiim.org/pdfa/ns/schema#
    • http://www.aiim.org/pdfa/ns/property#
    • http://www.aiim.org/pdfa/ns/id/

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