Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6aff1e86a105f9c…

MALICIOUS

PDF

65.5 KB Created: 2020-12-24 06:17:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7897ea29146732ecd3d350b8b639ed1 SHA-1: 7559762c81bb7912095cf9970c4dda1749ddd7e2 SHA-256: c6aff1e86a105f9ca02e1f8530dae01d7b840e12cf499742e914f99b89b3673f
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it likely contains malicious content. It features a link farm with numerous external PDF links, one of which points to a known malicious redirector. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/strik?utm_term=9+months+pregnant+symptoms+nausea
    • https://static.s123-cdn-static.com/uploads/4464871/normal_5fca8f66b96c6.pdf
    • https://cdn.sqhk.co/numanazolov/ichiyrR/cheesecake_recipe_with_cream_cheese_and_condensed_milk.pdf
    • https://cdn-cms.f-static.net/uploads/4401703/normal_5fa36f64455ec.pdf
    • https://cdn-cms.f-static.net/uploads/4481154/normal_5fad13103606a.pdf
    • https://cdn-cms.f-static.net/uploads/4367644/normal_5f875bc0a6bb2.pdf
    • https://cdn-cms.f-static.net/uploads/4483097/normal_5fb9147723767.pdf
    • https://fuwozubasuzej.weebly.com/uploads/1/3/4/4/134473550/d246fc79bb686f.pdf
    • https://cdn-cms.f-static.net/uploads/4424027/normal_5fbc5e01dd763.pdf
    • https://static.s123-cdn-static.com/uploads/4380890/normal_5fe185e9e949e.pdf
    • https://static.s123-cdn-static.com/uploads/4421329/normal_5fe2a8095a824.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gawabog/19970770768.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_off0000c586.bin
5a15053b2aebd1463ccd375a7388efce7a6b3082f291c2bfb03ced14dff9aff4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC586 5364 bytes
font_01_sfnt_off0000d79a.bin
66236fdc69d5fbbf2f7b1c8e0ccf8a92cda301b38d63a7df08e963143e24f909
pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 9892 bytes