Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4f9a1c8a812ad7…

MALICIOUS

PDF

112.3 KB Created: 2021-01-06 11:34:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e3119644cd8488940d2421f7d6f21264 SHA-1: ef7b4a716bbdf96f2b9010933dade1b332ddaf48 SHA-256: 1e4f9a1c8a812ad706fac913c57b6ed021de519a4993e25f399732fa92dcf7f1
234 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://gettraff.ru/aws?utm_term=chrome+browser++for+linux+32+bit'. This, combined with heuristics indicating a browser installation lure and a password-protected archive lure, strongly suggests a social engineering attack. The ML classifier also flagged the PDF with a high probability of being malicious. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gettraff.ru/aws?utm_term=chrome+browser++for+linux+32+bit In PDF document text
    • https://cdn-cms.f-static.net/uploads/4491671/normal_5faf6082d7d62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488570/normal_5faa1678973a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388608/normal_5fd66b8f9b704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414352/normal_5fb5ee2d71725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_5fad677a064d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471455/normal_5fe74bab16076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455196/normal_5faf00b006f93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dda3fcd-ec79-4f7c-a912-ea114ba3c1b7/92160229691.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/6925224862.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/weapons_of_anglo_saxons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee80250-f29c-4a12-8dfe-5e44aa0638f0/22661151938.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/su_song_that_trong_thien_chua_quyen_2.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/97437569411.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17941 5300 bytes
SHA-256: 3198c3b96ce8aaae0221bd4a12854df211874606f65fe8486fee301840cd7dc0
font_01_sfnt_off00018b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B33 11968 bytes
SHA-256: 617de3d39eb6e8fa2b94fdaceaee2b03cd4248392a6c655cbaf3d80b297b4452

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