Malicious PDF — malware analysis report

Static analysis result for SHA-256 693f9693624808da…

MALICIOUS

PDF

44.2 KB Created: 2020-11-08 12:49:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 27e1a62b6055ae07581e724d7a1a9fc6 SHA-1: 1d20a8ea86cdc454ffe1fd2d63a8a6a326714437 SHA-256: 693f9693624808da9b9b6caff47c231bfd3c418dfcb93f0da9f3104b5bbd8bbf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary external URL observed is https://traffnew.ru/123?keyword=monk+kensei+5e, and numerous other PDF links are present, suggesting a link farm or distribution mechanism. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • 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://traffnew.ru/123?keyword=monk+kensei+5e PDF link annotation
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/sixasunusimu_vezaninume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413566/normal_5f9d4722997c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_5f8b25eb5e3b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387816/normal_5f97ad4502286.pdfIn PDF document text
    • https://buxijoxusezo.weebly.com/uploads/1/3/1/4/131483018/dilizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411681/normal_5f9938258a0c7.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/lezukozikiwinenirib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_5f8a4c05e5dc6.pdfIn PDF document text
    • https://sazunanu.weebly.com/uploads/1/3/4/5/134596286/sajiwuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f92980d9f243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_5fa0fc50a1052.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/kufotikokugekadan.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/strike_force_4_hacked.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/bokiduvewomag.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_off00007154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7154 4532 bytes
SHA-256: 78a8dd2c30865d63accf0d39f58dcfa77d26e3aeda6fa7894fe11947302debc3
font_01_sfnt_off000080ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80EC 10420 bytes
SHA-256: 2e45b8b53b710cc876f6735140f695199bb872f7cafb131ad782cc0366be8c9a