Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4de2bfcf2da1d4…

MALICIOUS

PDF

43.7 KB Created: 2018-11-23 21:03:22 +03:00 Authoring application: Microsoft Word: LaserWriter 8 8.6.5 (via Acrobat Distiller 4.0 for Macintosh)
MD5: fb66149423e6e94d8e0bc53d520d12d1 SHA-1: ac4464d2ce24b1e9bc9c26ef449d8657552d1ec3 SHA-256: 3f4de2bfcf2da1d4af98411ec1bbe1e79852a9be91d11ceefd1f54d6ac370ef5
98 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript and a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged the document as malicious. The embedded JavaScript likely facilitates the distribution of these links or further malicious actions. The primary purpose appears to be SEO manipulation or acting as a dropper for other malicious content hosted on www.gorillawalker.com.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8224

Heuristics 3

  • 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 JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/the-crowd.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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