Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c55094a38083e9…

MALICIOUS

PDF

16.6 KB Created: 2020-11-03 10:38:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27df195d3d33c8145e6945ceecb88971 SHA-1: 36500c572b86ada0c1346f5a582647fc04ee45d4 SHA-256: a9c55094a38083e9068e028c94bb9c5deb9086c298a3ab1317a650f9ba9bd9fa
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, presenting itself as free sales tax worksheets but containing a hidden clickable link. The primary malicious URL, https://cctraff.ru/aws?keyword=free+sales+tax+worksheets, is identified as a redirector, likely leading to a phishing page or a download of further malicious content. The document also contains a large number of external PDF links, suggesting a link farm or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 16 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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/aws?keyword=free+sales+tax+worksheets
    • https://tagepixibupiz.weebly.com/uploads/1/3/4/5/134586800/905513.pdf
    • https://wavutokemik.weebly.com/uploads/1/3/4/3/134309613/refefanowox-bikuxudavopumep.pdf
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/15e43dbfda47b1.pdf
    • https://xozoravupot.weebly.com/uploads/1/3/4/3/134314106/gipedesopo.pdf
    • https://neburaguvud.weebly.com/uploads/1/3/4/4/134477844/b2b94c0.pdf
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/rarel.pdf
    • https://cdn.shopify.com/s/files/1/0432/1761/7057/files/value_proposition_design_wiley.pdf
    • https://s3.amazonaws.com/bugutaj/poripogosegijif.pdf
    • https://cdn.shopify.com/s/files/1/0499/1519/9646/files/64513481267.pdf
    • https://uploads.strikinglycdn.com/files/0111ff17-97ff-4f73-bfbf-0494df03cb83/73285584052.pdf
    • https://s3.amazonaws.com/ravuxudibure/az-_500_dumps.pdf
    • https://s3.amazonaws.com/subud/fodakojosetafavag.pdf
    • https://cdn.shopify.com/s/files/1/0439/1229/8648/files/dononozezijojedifaw.pdf
    • https://cdn.shopify.com/s/files/1/0480/1108/3935/files/nihongo_challenge_kanji_n4-5.pdf
    • https://uploads.strikinglycdn.com/files/16d92740-e153-44ba-8705-11727c83214f/kusadovagozogafomez.pdf
    • https://cdn.shopify.com/s/files/1/0508/0288/4779/files/pacific_theaters_sherman_oaks.pdf

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