Malicious PDF — malware analysis report

Static analysis result for SHA-256 f043b095ab242918…

MALICIOUS

PDF

44.1 KB Created: 2020-11-05 21:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bacf52d03abf5fda005c403145780f6d SHA-1: 1e7a21eb08fe7186fd2d6fe4f450e44a957efb39 SHA-256: f043b095ab242918342d29d5c0bde9a58752212b52d3042830b721cb36eb3d83
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, disguised as 'game rules', that point to various websites, including a known malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of multiple links to disposable hosting further supports a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the document's structure and embedded links are designed to facilitate user interaction leading to malicious sites.

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 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.
  • 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://traffine.ru/123?keyword=game+rules+of+card+game+go+fish In PDF document text
    • https://gunapozebufe.weebly.com/uploads/1/3/4/3/134316646/2120691.pdfIn PDF document text
    • https://sudateneturoxa.weebly.com/uploads/1/3/4/3/134322726/sizaseze.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/6323409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_5f968e90cac9a.pdfIn PDF document text
    • https://mebavowu.weebly.com/uploads/1/3/4/3/134353315/lafemarabivu.pdfIn PDF document text
    • https://bewimowijukoja.weebly.com/uploads/1/3/4/5/134584545/pezipu-gobale.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/4310928.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/26755b81-1b9a-4e87-aff3-d6614ab165a2/wazagepepiwitemomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcecc17b-5c83-47b8-aacc-84fda7fa606a/joxovesuzizulijovun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/688a32a2-506a-4948-8786-855be6e68a57/mozelezufej.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_off00006de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE9 5468 bytes
SHA-256: c0c4f30b3696c309ca77dd6cca8a7af3f4af31e2b4d922ec338d8c30c1036df6
font_01_sfnt_off00008054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8054 10520 bytes
SHA-256: 44dc1abb11ffa33a32636fe2402d8af8c715f23657832e262fd5daed81e39f27

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