Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22266e402e7c0a1…

MALICIOUS

PDF

58.3 KB Created: 2020-11-18 09:10:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a331ed0b5ef0e14aa74a2681e37593c3 SHA-1: d9a1da07c8ad8d45bc73f524deba6c6998b56b1d SHA-256: d22266e402e7c0a1be92ab8cf1e607455e430ce730225237b0faa48c66200604
212 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics, including a malicious redirector link and a link farm, indicating a phishing or SEO manipulation attempt. The embedded links, such as 'https://ggtraff.ru/strik?utm_term=competitive+maths+pdf', likely lead to malicious content or further phishing pages. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8255

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://ggtraff.ru/strik?utm_term=competitive+maths+pdf
    • https://cdn-cms.f-static.net/uploads/4413361/normal_5f95ec023bc23.pdf
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5fa2894013269.pdf
    • https://cdn-cms.f-static.net/uploads/4376404/normal_5f8d6156874d8.pdf
    • https://cdn-cms.f-static.net/uploads/4417046/normal_5fa5406f64e7f.pdf
    • https://cdn-cms.f-static.net/uploads/4478688/normal_5fad5760bda04.pdf
    • https://cdn-cms.f-static.net/uploads/4489595/normal_5fad3be0f1757.pdf
    • https://cdn-cms.f-static.net/uploads/4501770/normal_5fad8163ca966.pdf
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5fb409092b247.pdf
    • https://dudatagavadupim.weebly.com/uploads/1/3/4/4/134402573/refonomazojado.pdf
    • https://ziroluberunoreg.weebly.com/uploads/1/3/4/4/134456507/tizeza.pdf
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/voxifede.pdf
    • https://gozaxuvo.weebly.com/uploads/1/3/4/6/134612917/garuv.pdf
    • https://cdn-cms.f-static.net/uploads/4422643/normal_5f9d324ca3a33.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/44244701-7b78-4005-9af7-04a6db8f4edb/sat_2_biology.pdf
    • https://uploads.strikinglycdn.com/files/37bcd445-c20a-4c69-8c95-524d2cf8c3d6/baixar_musica_filme_armageddon_aeros.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd97.bin
b1dfcff6ccff5bcc5524b6b91ba534f3a1712dced14dd8176c63269475c48a4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD97 5116 bytes

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