Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfaf47494afa9e4…

MALICIOUS

PDF

73.3 KB Created: 2020-10-10 12:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9ff8beff65d592007fc4bb8fda03d4e0 SHA-1: e069ac5dd490d975018fcc44567f4f75dffd5289 SHA-256: 9cfaf47494afa9e4ae709200a958cd3440d3758a25f3bffacc1ef3d39634a087
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/strik. The ML classifier strongly indicated maliciousness, and the overall structure suggests a phishing or malware distribution 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://cctraff.ru/strik?keyword=guias+ada+2019+pdf In PDF document text
    • http://files.jlwarfield.com/uploads/1/3/1/8/131857717/vaminoluterexuj-vibapaxujonug-fixiku-vuzag.pdfIn PDF document text
    • http://vezuzumo.patricianesci.com/uploads/1/3/1/6/131637148/fexojometax-ladebozaxirus.pdfIn PDF document text
    • http://files.ballenislessgc.com/uploads/1/3/1/8/131858287/mumujikituxaxex-buletabilosugo-magujeze-zitizakenisok.pdfIn PDF document text
    • http://jixubem.onsitecprtrainer.com/uploads/1/3/0/7/130776886/rewiluterer.pdfIn PDF document text
    • http://pifibeluz.tinctureoftimellc.com/uploads/1/3/0/8/130873947/baponise-jemugizo.pdfIn PDF document text
    • http://files.kindredmassage.com/uploads/1/3/1/4/131406456/9bf6524f.pdfIn PDF document text
    • http://files.isoandbusinessexpert.com/uploads/1/3/0/8/130813797/noxodak.pdfIn PDF document text
    • http://files.semonstrobos.com/uploads/1/3/1/3/131380589/lenadurumenedorezas.pdfIn PDF document text
    • http://files.ywamshipsgulfcoast.org/uploads/1/3/1/3/131378816/kukabigo.pdfIn PDF document text
    • http://files.thebunsandbites.com/uploads/1/3/0/7/130738748/62ef65a7.pdfIn PDF document text
    • http://sixuk.nickwang.org/uploads/1/3/1/8/131856158/68dbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/79935631900.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1546/1285/files/gizarulotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/6251/7909/files/69731996313.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3648/2458/files/tamebi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/4252/5343/files/duberoxogeromujugokemiga.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 5420 bytes
SHA-256: c8e2980379b212fd9f0b4a8df53932d0aab5a17e8581f23759d6a9c755ec2f03
font_01_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 10836 bytes
SHA-256: 73e9cefa5ba05063e469359767209162f2c7c21836103f19299da9228db70068

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