Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f3f2b22fc54746…

MALICIOUS

PDF

53.9 KB Created: 2020-10-27 04:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a29e0bdc430e541948764b4649364f7f SHA-1: 9afd8b661df469e8454eaba73d5893fa7d4ad11d SHA-256: 08f3f2b22fc54746a018a4bf5a7083037dafcc4a12425d4a611852075e07ecf9
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL related to 'asus driver update utility license key'. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's part of a link farm designed for SEO manipulation to attract victims. No scripts were extracted, but the primary attack vector is the malicious redirector link.

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=asus+driver+update+utility+license+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_5f915fae3c071.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_5f912aa853006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f952f3a5a4f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415962/normal_5f964983c6ef9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_5f8e70d34f605.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d94e0b-e1f1-4613-91f9-9ec644356963/lasikafuzijal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d8ba9c-9b5a-4673-b5cd-e48cea17ecab/gerajozubovesuzijegowose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4add8003-bcaf-4d1f-bf48-c453954c8590/79919849386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d46540dc-91d3-48d2-9bc3-96db69944c4a/53608535154.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/7248/1190/files/midufefutuzoguzurodokated.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3626/9470/files/zokuba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3268/8293/files/97069177183.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1052/5853/files/dutel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9703/4393/files/37729604423.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9898/7414/files/bo_staff_training_book.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/faravexofowunezexitav.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/cours_cardiopathie_congnitale.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_off000094b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94B9 5284 bytes
SHA-256: ca818459e4d0cf7ad1f7dddd49ef423984f618c61c44ddd46bf35c8b4200af34
font_01_sfnt_off0000a6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6C1 10388 bytes
SHA-256: 38d4a611975d4ffb149fa3161f7ec044c2d0e595d13cca125945ccbfe5ce95b6

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