Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf8d6d7b710f0a8…

MALICIOUS

PDF

72.0 KB Created: 2020-09-30 13:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 400ae2260f0b18f3a976074c58e5d137 SHA-1: dce2fb8d124fa02a9fc88e50ce7a552ea6ef4f73 SHA-256: bdf8d6d7b710f0a80f4c242454c5d4769b857a14e5c795819d3d000153007650
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable infrastructure. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the document is designed to lead users to harmful sites. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 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.
  • 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://cctraff.ru/strik?keyword=bell%2527+s+palsy+treatment+pdf In PDF document text
    • http://jatexuz.atlchester.com/uploads/1/3/1/4/131406592/978fe5.pdfIn PDF document text
    • http://files.nipomodrama.com/uploads/1/3/1/1/131163977/dazovugiweterax.pdfIn PDF document text
    • http://xuvelozu.southcentralsetac.com/uploads/1/3/1/3/131384609/bf8daf789c448c.pdfIn PDF document text
    • http://files.yschemenauer.com/uploads/1/3/0/7/130739474/a8166.pdfIn PDF document text
    • http://rijotiw.avalonlinenrental.com/uploads/1/3/1/3/131381675/kowomim_jenaj_golufixabe.pdfIn PDF document text
    • http://lagetemu.binksgames.com/uploads/1/3/1/3/131383544/letebekamanugab_kofafaxo_ninipekub_sawadopofi.pdfIn PDF document text
    • http://pururawex.brightideasantiques.com/uploads/1/3/0/8/130873730/64ebf705d.pdfIn PDF document text
    • https://site-1036996.mozfiles.com/files/1036996/55878200626.pdfIn PDF document text
    • https://site-1036735.mozfiles.com/files/1036735/51159517051.pdfIn PDF document text
    • http://files.offthebeatentreks.org/uploads/1/3/0/8/130873830/wupipadizifuzi.pdfIn PDF document text
    • http://zurukeruf.spacetimeandquantum.com/uploads/1/3/2/6/132696056/widanumakasi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 5372 bytes
SHA-256: a7e3aa84484d280f6e366f7c2c4a9cd7a6324fdd60043ff08fd7d5eb781014b0
font_01_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 10796 bytes
SHA-256: 0c62e2e7eddae416f75f0d872c190a41617c486e28c3e7389f5f35789a744016

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