Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6b623be149ecfe…

MALICIOUS

PDF

31.5 KB Created: 2020-11-03 05:12:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a04329e7b02d9d276585d9861e559617 SHA-1: 53a87790f8229870cdc377bf0ee06e20e3510378 SHA-256: ad6b623be149ecfeee89bce0ec1cba8857b1d2d120c8643c1079c24c872e2619
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to known malicious infrastructure, disguised with a seemingly innocuous keyword related to firearm tuning. The document also contains a large number of external links, many of which point to PDF files hosted on content delivery networks, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 3

  • 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.
  • 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=ruger+mark+ii+magazine+tuning
    • https://cdn-cms.f-static.net/uploads/4381302/normal_5f9f27b14a878.pdf
    • https://cdn-cms.f-static.net/uploads/4387811/normal_5f96ef5a27c42.pdf
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f8cce32d9fd4.pdf
    • https://cdn-cms.f-static.net/uploads/4420761/normal_5fa0b927ecc85.pdf
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5f9bd318897a6.pdf
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5f89b0e378a17.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tedowafomaru/symbolic_logic_carroll.pdf
    • https://s3.amazonaws.com/zurovajij/tixesotogibiletenoxexa.pdf
    • https://cdn.shopify.com/s/files/1/0499/4816/4248/files/26284491959.pdf
    • https://cdn.shopify.com/s/files/1/0506/3678/3777/files/mr_boston_bartender_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/kivaluxipuxebovokoxo.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c68.bin
4a4b43aa3fd752d08dffac44ebff91ba21c189e72b96ab51f670f84cb23e4c18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C68 4916 bytes

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