Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ffd234457dc14d…

MALICIOUS

PDF

116.2 KB Created: 2020-11-21 23:08:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd02a37c1d6b60d07ae6ece0275f3814 SHA-1: 5b85fc069e0709556a9a545047b33ab6e7987aa6 SHA-256: b9ffd234457dc14d1aa9614d190864ad5da7a7c36039a26ff3a5e2060aa429ff
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the presence of numerous links suggests an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/123?utm_term=ranger+archetypes+pathfinder+2e
    • https://punizino.weebly.com/uploads/1/3/4/3/134327780/nojil_ribufukiwefa.pdf
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5faba35602bb5.pdf
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5f90faa978b72.pdf
    • https://cdn-cms.f-static.net/uploads/4454281/normal_5fb82724bec56.pdf
    • https://cdn-cms.f-static.net/uploads/4417037/normal_5f998495aa30b.pdf
    • https://cdn-cms.f-static.net/uploads/4375194/normal_5f8a085d04f75.pdf
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f8ce862c1f14.pdf
    • https://cdn-cms.f-static.net/uploads/4382948/normal_5f905a9b51ceb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pusixa/17741364244.pdf
    • https://s3.amazonaws.com/zuxadol/potaw.pdf
    • https://s3.amazonaws.com/sodoxi/xokapoboxawugufixixagit.pdf
    • https://s3.amazonaws.com/dejolavubukugeb/zavelisozodujurijer.pdf
    • https://s3.amazonaws.com/subud/42423464739.pdf
    • https://s3.amazonaws.com/netinuwa/lisedigedisakelukewi.pdf
    • https://s3.amazonaws.com/tubukeganuji/55288736587.pdf
    • https://s3.amazonaws.com/lixuduwonifa/pourquoi_travailler_dans_le_secteur_public.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018c55.bin
44354719cec7e8add8c75f11d9d296d44cc71bcbafacb981321702dd97ce7418
pdf-font-stream PDF embedded font (sfnt) at offset 0x18C55 5624 bytes
font_01_sfnt_off00019f83.bin
cb1c08d0fce6369354e497f7f32100e174ce57aef717f064bf120a7b8f4ef3b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x19F83 10600 bytes