Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd78a1f1172003eb…

MALICIOUS

PDF

77.5 KB Created: 2020-11-09 18:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10d00fc9219b6ad6ab9951d7e1de3285 SHA-1: 0f65fc2120d520e82808aecb6597bbb28f943a0e SHA-256: cd78a1f1172003eb2eea80ffeb69ee5c0e765d427f74086ea33dfb35b25a2404
212 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to 'Stubhub reviews and complaints'. The presence of PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8877

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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?keyword=stubhub+reviews+and+complaints
    • https://papuxivosep.weebly.com/uploads/1/3/4/4/134491017/555e0993c4c8.pdf
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/bilupamajopi.pdf
    • https://cdn-cms.f-static.net/uploads/4404987/normal_5fa1939a6d36f.pdf
    • https://xotukejurivaj.weebly.com/uploads/1/3/4/0/134016857/945786.pdf
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f8d9c14daf27.pdf
    • https://cdn-cms.f-static.net/uploads/4459482/normal_5fa20b30145a4.pdf
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/golelid.pdf
    • https://dazowuxope.weebly.com/uploads/1/3/4/3/134319454/sijalunibobar.pdf
    • https://cdn-cms.f-static.net/uploads/4422390/normal_5fa2692da7972.pdf
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/jazezibijukugegegi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/721cfee0-0fdd-406f-a459-97b2580ef857/apa_citation_for_merck_manual_online.pdf
    • https://uploads.strikinglycdn.com/files/451de7f7-374f-4662-affa-4348f90cc9d7/teoria_campo_magnetico_2_bachillerat.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a43.bin
c80844d59de2702af54b6dc583c8e4674e85acc3c83279f917c38228c8b30eab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A43 5708 bytes

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