Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba3880024019670…

MALICIOUS

PDF

45.1 KB Created: 2019-04-30 15:57:32 +03:00 Authoring application: TeX (via pdfTeX-0.14f)
MD5: d8a785ad1fb3bf321020ec4fadef5fce SHA-1: b5efa9a3d03ba9761fa0ba3800b9c1f50c1cb6da SHA-256: 1ba38800240196705b898577a26b6ac76aa851e7ce09a6e7c7c84e7f72c02137
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files, a technique often used for SEO poisoning or to distribute malicious content. The ML classifier also flagged this PDF as malicious. No scripts were extracted from this sample, and the document body was heavily obfuscated, making it difficult to determine the exact payload or intent beyond linking to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8812

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/acci-n-de-cesaci-n-art-7-2-lph-un.pdf
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    • http://www.gorillawalker.com/pie-recipes-postcard-book.pdf
    • http://www.gorillawalker.com/shakespeare-s-america-america-s-shakespeare-routledge-revivals.pdf
    • http://www.gorillawalker.com/learning-from-case-studies.pdf
    • http://www.gorillawalker.com/humble-apologetics-defending-the-faith-today.pdf
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    • http://www.gorillawalker.com/the-pattern-of-our-days-worship-in-the-celtic-tradition.pdf
    • http://www.gorillawalker.com/the-shadow-elf-kindle-edition.pdf
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    • http://www.gorillawalker.com/cinnamon-kiss-a-novel-easy-rawlins-mysteries.pdf
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    • http://www.gorillawalker.com/bruce-catton-s-civil-war.pdf
    • 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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