Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a42d00c00f7f78…

MALICIOUS

PDF

37.9 KB Created: 2020-11-06 01:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 92241ab75a4012140767ea58fb2b62cc SHA-1: 2669595d2a90a8d7d515f9aff851c18222b40031 SHA-256: b0a42d00c00f7f7829176d4820c5e00996da84b8a21ed4de918aebfa428610d3
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links pointing to various websites, including a suspicious domain 'trafffe.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafffe.ru/strik?keyword=key+blank+reference+guide PDF link annotation
    • https://vokudaminovisuz.weebly.com/uploads/1/3/4/4/134495340/d2f5c9f2.pdfIn PDF document text
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/sabelakepusites.pdfIn PDF document text
    • https://fubasuwa.weebly.com/uploads/1/3/4/6/134611144/2938316.pdfIn PDF document text
    • https://nujidigazinuwag.weebly.com/uploads/1/3/4/3/134318548/jedidod.pdfIn PDF document text
    • https://guserokofetaw.weebly.com/uploads/1/3/4/3/134341966/9bb53fa97fd08d.pdfIn PDF document text
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/ravora-tamapazul-sunogezesasoz-ralitazit.pdfIn PDF document text
    • https://zemejinifuv.weebly.com/uploads/1/3/4/5/134577925/gexubilutab.pdfIn PDF document text
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/6761699.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/ab4d95ba-94a2-4952-b4c6-d9fd385d1c78/84542791122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68721f37-1d54-43fb-b753-f213d95113a0/vufawasilozimodarisesisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b88f2898-43fb-4b61-a2dd-05e778e669d6/sunawijasadufigez.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/dragon_quest_vi_vocation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef9b2492-3da7-40ce-a386-ce6bb08a5711/sofiw.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/shape_memory_alloys_applications.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/40208187535.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_off000052f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52F9 5288 bytes
SHA-256: 1bd1ae80fd373e0258121344baf4d13ca39124ba06fbf7e2264bb259f3109379
font_01_sfnt_off00006512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6512 11128 bytes
SHA-256: 91e7dcf8f61a67d1782140c42d6155a0f36ae5c706c61a99cefbd286154c3b4a

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