Malicious PDF — malware analysis report

Static analysis result for SHA-256 4323595b067b1d56…

MALICIOUS

PDF

133.1 KB Created: 2020-10-16 22:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b7c156cf192ccdc4e8654f256437799e SHA-1: 94c3058a225d9e985ebdeb7eb420d5745c0e43fb SHA-256: 4323595b067b1d56260d80c709c08b991a0fa56e0c9de40a5aa7808ab7a94935
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external PDF files, suggesting it is part of a link farm or SEO manipulation tactic. One prominent link, 'https://gettraff.ru/strik?keyword=ecuaciones+diferenciales+makarenko+s', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is designed to lead users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gettraff.ru/strik?keyword=ecuaciones+diferenciales+makarenko+s In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f87551b6ead7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f87540e850c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f870dd7cb42c.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/zebapesuluboxaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f874f9d5f49c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f8752fda3a38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f87199501de1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5f886e0f6bca0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5f88b4431e291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f88910492058.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/1/0437/7142/9025/files/fawiwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7322/2294/files/civil_service_exam_nj_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/4730/5635/files/zepabonomesagujepubotitap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5731/8561/files/african_dress_patterns_for_sewing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1329/9102/files/42020044703.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/4401/5775/files/time_and_patience_jamaica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0050/6785/files/the_current_document_is_protected_foxit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4396/3548/files/93270235743.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A50E 5188 bytes
SHA-256: 02e121c36f34c2f0d65c66ebdb889db90560eb46cb08e2e8e3a607416b6c9514
font_01_sfnt_off0001b697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B697 19492 bytes
SHA-256: 4c5ffa66322eca1bfad7fc32c02d550bef3d8eb8ca09798a28e7f60c6e1657af
font_02_sfnt_off0001f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F184 16076 bytes
SHA-256: ff25e7f6a43f1b59442a35e56bc56f3cfd2cff6193593d34390440b8d778df35

Open this report in the interactive analyzer, or submit your own file for analysis.