Malicious PDF — malware analysis report

Static analysis result for SHA-256 6244ac598cf7154b…

MALICIOUS

PDF

72.3 KB Created: 2020-12-24 15:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99a07c6f16d780bc6d433a72ab7e99c4 SHA-1: 712f2af60fb2c5878e26453516416b100177f9c1 SHA-256: 6244ac598cf7154b09bb7750336edd22ba100a6453c38255354dd9b2425cdf81
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'traffmen.ru'. This URL is presented in the context of information about Hepatitis B, suggesting a phishing or scam lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a malicious URL is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=hepatitis+b+surface+antibody+reactive+que+significa
    • https://static.s123-cdn-static.com/uploads/4469831/normal_5fe0748c31a4f.pdf
    • https://cdn-cms.f-static.net/uploads/4381095/normal_5f8dd8579440e.pdf
    • https://static.s123-cdn-static.com/uploads/4450514/normal_5fd068517dd27.pdf
    • https://cdn-cms.f-static.net/uploads/4410962/normal_5fb77568f2f89.pdf
    • https://cdn.sqhk.co/merivexasug/hdogghy/kamole.pdf
    • https://cdn-cms.f-static.net/uploads/4404112/normal_5fd27cb104d92.pdf
    • https://cdn-cms.f-static.net/uploads/4379960/normal_5f9c7a4d97285.pdf
    • https://cdn-cms.f-static.net/uploads/4501193/normal_5fb6e645018ec.pdf
    • https://cdn-cms.f-static.net/uploads/4410985/normal_5fa0e2c149303.pdf
    • https://static.s123-cdn-static.com/uploads/4412896/normal_5fce276b7df67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gewuwasi/sejaxurowulom.pdf
    • https://uploads.strikinglycdn.com/files/b752f715-960c-4a87-a2d2-804be5ddca9a/59095842909.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_off0000db53.bin
efafbf3e6d9197dd5eb00ed977a8ded821019be95037313d59d2802a626b862c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 5680 bytes
font_01_sfnt_off0000eeb3.bin
6510fe1b8e03206b4e6483c365cb2835e5c84d435e1a079ff35ade728f38c9e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 11236 bytes

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