Malicious PDF — malware analysis report

Static analysis result for SHA-256 645c633d8bfeed55…

MALICIOUS

PDF

61.0 KB Created: 2020-12-17 15:26:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5431db1e958da90c85a97177d63cc916 SHA-1: 1b6a98d1ac8e79fd07af2cd15efcc0a61ccf4f6b SHA-256: 645c633d8bfeed55eac82c6859e1982599adcacfbca282e090b38cebd5a2cc83
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 indicates the document's primary purpose is to lure the user to a potentially harmful external site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient to infer a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-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=shoot+style+deku+nendoroid
    • https://cdn-cms.f-static.net/uploads/4378628/normal_5fa9045e69bd5.pdf
    • https://cdn-cms.f-static.net/uploads/4377909/normal_5fc339534e169.pdf
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5f8f41cd20095.pdf
    • https://cdn-cms.f-static.net/uploads/4373511/normal_5fa838fc9faed.pdf
    • https://cdn-cms.f-static.net/uploads/4381751/normal_5f973f29c6208.pdf
    • https://static.s123-cdn-static.com/uploads/4451021/normal_5fcf4b90763c0.pdf
    • https://cdn-cms.f-static.net/uploads/4369486/normal_5fb5ea5c1a472.pdf
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f9c7a771e474.pdf
    • https://cdn-cms.f-static.net/uploads/4379723/normal_5fa28c0cc6c76.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe03f47acac6192a87290e/1606288375270/85904854870.pdf
    • https://static1.squarespace.com/static/5fc10f3717e7202640eb17fd/t/5fc4cd293c02f22b9da3ec02/1606733098422/cute_panda_pictures_real.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_off0000af59.bin
fcec492d6e6e05865e70fe4d7b0a6579a8a7b8b3ffa6c971e879fc02982ec0bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF59 4972 bytes
font_01_sfnt_off0000c040.bin
34c56df994520e1fae4a7dbd218a6405053abcaf11cc416d6262c36c910a8ef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC040 11072 bytes

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