Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe0549a386a1b15…

MALICIOUS

PDF

58.3 KB Created: 2020-11-10 10:15:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: dc4b47f3855c23d309798724cbda3454 SHA-1: 92b2c6a860c9d698a18945ac4a4ce189e3fe2dff SHA-256: cfe0549a386a1b15b17494f4b0be38528d71ec9c44fd34a65d173ef53698cf1f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are disguised as educational materials, indicating a link farm or SEO poisoning attempt. One of the primary external links, 'https://trafffi.ru/strik?keyword=student+interest+surveys', suggests a lure to a malicious website. The ML classifier also flagged the PDF as malicious. No scripts were extracted, but the PDF structure and numerous external links point to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8539

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/strik?keyword=student+interest+surveys PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465400/normal_5faa458d895bb.pdfIn PDF document text
    • https://finijuzado.weebly.com/uploads/1/3/4/4/134444754/d25bd313559ad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379732/normal_5fa0359bdb775.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/pulezezop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_5f98ca20a2486.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/addition_worksheets_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/health_risk_assessment_navy.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/fifalirivexurix.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/feriados_2016_puerto_rico.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/41658354900.pdfIn PDF document text