Malicious PDF — malware analysis report

Static analysis result for SHA-256 1958199bd276d49b…

MALICIOUS

PDF

41.5 KB Created: 2020-08-03 17:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4324179274eec78329d3e294269710da SHA-1: 06bdaf6ca41944d883149c113e853bdd44a2425c SHA-256: 1958199bd276d49bca7c980da4714abde1d135d53cdd7047cb05e5fe2cd875dd
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.com/pify?keyword=reading+comprehension+b1+pdf+british+council', is flagged as a malicious redirector. The document body also contains numerous links to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.com/pify?keyword=reading+comprehension+b1+pdf+british+council
    • http://files.worldwar2under16s.com/uploads/1/3/1/6/131606056/dorijafaveri_kojopepo.pdf
    • http://files.beworldwise.com/uploads/1/3/0/9/130969041/2a52b162c987.pdf
    • http://files.belmardemocrats.org/uploads/1/3/0/7/130776228/795741cad6266.pdf
    • http://files.miazaros.com/uploads/1/3/0/9/130968985/nerok.pdf
    • http://jozizopit.raverstoriesproject.com/uploads/1/3/0/8/130814575/7353180.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/1777/8838/files/gojonizelavoteja.pdf
    • https://cdn.shopify.com/s/files/1/0431/3369/8209/files/kebirinavifaxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/nuxiwofenan.pdf
    • https://cdn.shopify.com/s/files/1/0431/5892/9570/files/barreiras_da_comunicao_organizacional.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/wugoxeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/pekakogudu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7745/9365/files/73102494519.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5074/files/zafagedeselawis.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/5383752229.pdf
    • https://cdn.shopify.com/s/files/1/0437/1097/2053/files/bavasumejulefasupive.pdf
    • https://cdn.shopify.com/s/files/1/0438/2251/4338/files/java_read_file.pdf
    • https://cdn.shopify.com/s/files/1/0431/1112/1063/files/navy_prt_instruction_2016.pdf
    • https://cdn.shopify.com/s/files/1/0434/1297/9869/files/65222460582.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000639c.bin
6f4cd084a26f81711618e2652a815de4119a09f45f489925226e13257dcc547d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x639C 5768 bytes
font_01_sfnt_off0000771b.bin
8edcbd3d57b980f6b54f563cb660cde4e71857410dde622f75b707feb8cddc77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771B 9904 bytes

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