Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fa22e4df04a55f…

MALICIOUS

PDF

78.0 KB Created: 2020-12-22 09:29:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 004ba561d375b0ba540835f23b47c0d4 SHA-1: 7029f3280f06b8d63cf9ecc8246145f32799d418 SHA-256: f6fa22e4df04a55f9b6353780274dbc4af86a76b5fbc2fa44e2d9e70aaf092d2
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/strik?utm_term=fall+guys+minigames+list PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389384/normal_5f977c8d4bcde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472776/normal_5fa78b6d769ff.pdfIn PDF document text
    • https://bitoxusimafitaj.weebly.com/uploads/1/3/4/3/134311342/runamituvaralepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_5fbf30468d2ab.pdfIn PDF document text
    • https://sabadefupi.weebly.com/uploads/1/3/4/3/134345863/balunifawutuj_kifawog_fonakitunizapub_rojubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5fc02772147ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426063/normal_5fd927843a517.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/3db96e.pdfIn PDF document text
    • https://nigelatadumave.weebly.com/uploads/1/3/4/6/134615228/duzizumawer.pdfIn PDF document text
    • https://fenogelojana.weebly.com/uploads/1/3/4/9/134904444/badutibun_kerinav_detefebu_pamaw.pdfIn PDF document text
    • https://sopetenoredu.weebly.com/uploads/1/3/5/3/135318191/tuxiwezewani-gajowuremuwuvi-danulezep-lugawu.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/6cfb74a7-324e-46ce-b685-89ff060d5a21/27699900948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c2f384b-501d-415d-a195-61086e83495a/8434980919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd398b04-a7da-454d-b69d-289dd3519482/wututozaxereziletara.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/17816269915.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/kawuwevupadudiwukinur.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_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 4968 bytes
SHA-256: 27a0d5e0753f49e58963e37b7c5a94a2b295a75091033f53957315bb8aa11f5c
font_01_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 11456 bytes
SHA-256: 17e809c2ffc7a7b22f517305a412290dc81ee49c97cac149465495457f6d8d2c

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