Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83b96bbdb98da7c…

MALICIOUS

PDF

31.7 KB Created: 2020-11-07 01:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 58038649ce195a9af104dc0e7110e97d SHA-1: 976f4d3dcab56caca5fa2ec330483dee31ac68d9 SHA-256: e83b96bbdb98da7c31bb3304b3b962f91fbe8ea2bbedcd2104d1076c90d879e6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, identified as a link farm. The primary URL, 'https://trafftec.ru/123?keyword=soap+box+derby+car+wheels+for+sale', suggests a potential SEO manipulation or traffic redirection scheme. The presence of numerous links to other PDFs on disposable hosting further supports the idea that this document is part of a larger infrastructure for distributing content or potentially malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafftec.ru/123?keyword=soap+box+derby+car+wheels+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405902/normal_5f91e92d19d07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388289/normal_5f8efe58748fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_5f9d83abd8487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_5f8d146fe98e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5f8a2fdd191f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426955/normal_5fa06d6684956.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vumirar.files.wordpress.com/2020/11/dijikuzozumomujezigewuz.pdfIn PDF document text
    • https://mabijiwe.files.wordpress.com/2020/11/37552510625.pdfIn PDF document text
    • https://tijemumupe.files.wordpress.com/2020/11/98611808987.pdfIn PDF document text
    • https://fozevetob.files.wordpress.com/2020/11/megavokig.pdfIn PDF document text
    • https://kitobus.files.wordpress.com/2020/11/cicala_e_formica_fiaba.pdfIn PDF document text
    • https://zinipudugeti.files.wordpress.com/2020/11/no_fale_com_estranhos_harlan_coben.pdfIn PDF document text
    • https://zatejoru847961968.files.wordpress.com/2020/11/72489844693.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_off00003fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3FC8 5748 bytes
SHA-256: a79235306efface8dacfeb272f2f2a987fe1a4b3556114bc29fd16dd28e5bc1e
font_01_sfnt_off0000536c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x536C 8948 bytes
SHA-256: 751eeda13f07c8c4faf5e6b2f13ca0cf3abdbefe312f1e344904b7c19c432ef5

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