Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb91d245470c7dfb…

MALICIOUS

PDF

34.7 KB Created: 2020-11-02 23:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17abde7e7cb8ea18aced24b87760e3e8 SHA-1: f7ed81b82f24184f0414cb561d4cb7c050385927 SHA-256: cb91d245470c7dfbe68afeb7b02ebe5d198001093a6847a943bfdf4873c22508
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm. One of the primary links, https://gettraff.ru/strik?keyword=joel+karty+organic+chemistry+2nd+edition+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL and appears to be generated by wkhtmltopdf, suggesting a programmatic approach to creating this link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gettraff.ru/strik?keyword=joel+karty+organic+chemistry+2nd+edition+pdf
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f98f87a357a5.pdf
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5f9485e03c36d.pdf
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/676684.pdf
    • https://toreliga.weebly.com/uploads/1/3/4/3/134335880/golifoz.pdf
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f8e2c88349ce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0501/7131/4328/files/61555607960.pdf
    • https://cdn.shopify.com/s/files/1/0499/1634/6536/files/shu_social_link.pdf
    • https://uploads.strikinglycdn.com/files/818f6b16-82fa-433a-8522-fae91e7ab5e4/novelas_romanticas_cortas_2010.pdf
    • https://uploads.strikinglycdn.com/files/ee0d30cd-f6c9-4b21-9b84-536ccdfc8f37/34266368511.pdf
    • https://cdn.shopify.com/s/files/1/0506/0309/8288/files/when_writing_a_letter_to_a_judge_sample.pdf
    • https://s3.amazonaws.com/bezegoluzose/18504866700.pdf
    • https://uploads.strikinglycdn.com/files/289a4738-bcfa-4742-9e4d-33ac1b9ade1d/lidegibosupilefajafale.pdf
    • https://cdn.shopify.com/s/files/1/0483/2296/9764/files/june_2015_chemistry_regents_answer_key.pdf
    • https://s3.amazonaws.com/tapexiw/kegopunelosipegiz.pdf
    • https://uploads.strikinglycdn.com/files/6b33134b-766d-4a2b-9a3c-3c8f44bc616a/memodofeta.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000703c.bin
52b0d2ca943631fa88c34b666dedc9b54ddf913528d67dbdb8d2ee440d83d824		 pdf-font-stream PDF embedded font (sfnt) at offset 0x703C 5856 bytes

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