Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7a111dbdb90d71…

MALICIOUS

PDF

45.4 KB Created: 2020-11-02 16:29:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f7e19d125ac2dc3045838aa1ada36bf7 SHA-1: 929b7fabaa4728db74c421790f580f491c6db539 SHA-256: fe7a111dbdb90d710797a11fa757f035435330a3be1243d97630f9e21c3a6b3c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ggtraff.ru/strik?keyword=example+extended+essay+ib In PDF document text
    • https://megeleju.weebly.com/uploads/1/3/4/3/134319984/629a99d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404133/normal_5f9f1014c3b73.pdfIn PDF document text
    • https://jafexilodivoso.weebly.com/uploads/1/3/4/4/134499272/4cede.pdfIn PDF document text
    • https://visoruze.weebly.com/uploads/1/3/4/1/134109001/cfa41c17ff5fb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f8b4d4ea2bb5.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/1/0500/9968/3489/files/the_warren_buffett_way_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/4762/5119/files/vicious_novel_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1739/0245/files/welubi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5008/5781/files/montgomery_college_campus_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9584/1731/files/tipararali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7784/2597/files/norovirus_outbreak_management_and_disease_prevention_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/0515/2917/files/mutirosevifofi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/8285/2768/files/14913232649.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9366/0326/files/lowoberovubibaravitis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/9995/8680/files/differential_diagnosis_of_diabetes_mellitus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0784/2725/files/hotstar_old_apk_download.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_off000071cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71CD 5276 bytes
SHA-256: 17033e46fdc4a097f00b41b30edd491502e7c2c738f68d9670a01c75bf40319b
font_01_sfnt_off000083b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B5 10868 bytes
SHA-256: 2567c1a837f6979386eafd12e7cb75b5e7ff6ca6b13e5bd0f0aadf9c40000c49

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