Malicious PDF — malware analysis report

Static analysis result for SHA-256 922d9deb1df8482c…

MALICIOUS

PDF

67.6 KB Created: 2020-11-10 21:33:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffb5709468fb8b252477be3f263fcc51 SHA-1: 5ab706d238f1b501fce5df14819ebe521bc2abca SHA-256: 922d9deb1df8482c4f7c4540f904ffbc17af85953401d216bd03c82562142eb5
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a PDF SEO link farm. The document contains numerous external links, with the primary malicious URL being https://ggtraff.ru/strik?keyword=pontiac+casting+numbers+heads. The ML classifier and ClamAV also strongly indicated maliciousness, suggesting the file's purpose is to redirect users to potentially harmful content or phishing sites.

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-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://ggtraff.ru/strik?keyword=pontiac+casting+numbers+heads
    • https://cdn-cms.f-static.net/uploads/4450438/normal_5f9faca061ba7.pdf
    • https://cdn-cms.f-static.net/uploads/4446378/normal_5fa0e07d58fb6.pdf
    • https://kagilovudugavap.weebly.com/uploads/1/3/1/1/131164538/pexuxulizifi.pdf
    • https://cdn-cms.f-static.net/uploads/4385207/normal_5f8d321e9bbfe.pdf
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5f93c6449e78a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e8787481-828f-434c-8607-c13f5bc5ddd7/19655631505.pdf
    • https://uploads.strikinglycdn.com/files/5055dd85-fde1-49ba-8a2a-bbca3282e512/zemonaxotoj.pdf
    • https://s3.amazonaws.com/leguvefu/fizewipola.pdf
    • https://uploads.strikinglycdn.com/files/1d9fc7a9-b828-4405-936b-3a7d8ab15956/snap_on_solus_update_download.pdf
    • https://uploads.strikinglycdn.com/files/bca5f68d-7aae-49d8-9055-81f1a4a7f193/sinogesugonanabudibaga.pdf
    • https://uploads.strikinglycdn.com/files/5f2f7be4-3d9c-4f77-a05b-1a3b8385f72e/16854466973.pdf
    • https://s3.amazonaws.com/nitajosasa/bedazux.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_off0000c927.bin
2a8f5cc72b905f4ed36e54e162ae87627de50489386bf7e54538e8d1ffd8fca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 5460 bytes
font_01_sfnt_off0000db86.bin
3c5e456ea187c85709b316a8dee70e4fb0d8466ca8d3b71d8305d921883d5519		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB86 10828 bytes

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