Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cfb8dec77a1280…

MALICIOUS

PDF

68.7 KB Created: 2020-11-13 11:56:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d93f3efd96ce7abd0574a49d14875568 SHA-1: 77c700a679ca3f45df21dc63d05b5d07fd30b381 SHA-256: d1cfb8dec77a12800e541fa0615ed70255cf41e2dbb8646660789de124374031
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure or are part of a link farm. The primary malicious URL identified is https://cctraff.ru/strik?utm_term=anime+drawing+tutorial+book+pdf, which is likely used to redirect users to further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://cctraff.ru/strik?utm_term=anime+drawing+tutorial+book+pdf
    • https://cdn-cms.f-static.net/uploads/4366347/normal_5f8be6130521d.pdf
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5f9c9aa7120ec.pdf
    • https://fobuxowomi.weebly.com/uploads/1/3/4/2/134235628/3280600.pdf
    • https://bidiguregila.weebly.com/uploads/1/3/4/7/134700143/refesevetime.pdf
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f873a331a5c3.pdf
    • https://mokufomaduw.weebly.com/uploads/1/3/4/6/134600220/3a66439f5b6198.pdf
    • https://cdn-cms.f-static.net/uploads/4452608/normal_5fa50a07a02e8.pdf
    • https://kuvetofuba.weebly.com/uploads/1/3/4/6/134607492/7b4c8e1c0d75.pdf
    • https://jafadunew.weebly.com/uploads/1/3/4/6/134632108/1078001.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/saziwijaxodav/los_10_principios_de_la_economia.pdf
    • https://uploads.strikinglycdn.com/files/be30a3ba-cc21-4516-81a2-6328020854ae/justin_bieber_crocs.pdf
    • https://uploads.strikinglycdn.com/files/0a2d1d8a-0f9e-4a4b-9fca-a8cf1829977e/lilupiraxesavoj.pdf
    • https://uploads.strikinglycdn.com/files/dbda286a-d268-4123-bc70-41f99f56efa5/fuxaroda.pdf
    • https://s3.amazonaws.com/wegugus/sotexijov.pdf
    • https://uploads.strikinglycdn.com/files/aaf14df1-644f-4c8e-b7d8-35956f7a3d99/march_john_lewis.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_off0000d07c.bin
4534cb689648a3c0f9fadf4ac001ae10e160d87d2a61975d4777301e1630ae92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 5468 bytes
font_01_sfnt_off0000e314.bin
1d6143a729c968e143c487403c2338515127fc1c6366160fc2b14c11c2b6d122		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 10044 bytes

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