Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9eda30500be716a…

MALICIOUS

PDF

58.1 KB Created: 2020-11-18 07:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac8e88ce3e10bd9fcb04518120d20bfc SHA-1: 7814fa65c91ac834206f00e2ac9fb16c5dcc7d86 SHA-256: a9eda30500be716afa9f1363a5afb2dcfd70d0238c5d9253dd5f92e7ae1d8f14
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'traffmen.ru'. ML classification and ClamAV also flagged this file as malicious. The embedded URL is likely used to lure the user to a phishing site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://traffmen.ru/123?utm_term=ring+leader+costume+baby
    • https://cdn-cms.f-static.net/uploads/4472766/normal_5faa6db325360.pdf
    • https://cdn-cms.f-static.net/uploads/4407810/normal_5f969ecd170e4.pdf
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5f9dc0fd8b205.pdf
    • https://cdn-cms.f-static.net/uploads/4477139/normal_5fa86ba543d13.pdf
    • https://cdn-cms.f-static.net/uploads/4418192/normal_5faae99140ea8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a2b7a57a-0337-4e0f-a149-1f74cdfb5692/ziregoduvedumizodumekiruk.pdf
    • https://s3.amazonaws.com/voropa/lease_agreement_texas.pdf
    • https://uploads.strikinglycdn.com/files/de027c12-c1ab-48f2-9c61-27d41fb02290/reading_and_study_workbook_pearson_c.pdf
    • https://s3.amazonaws.com/gazijewevan/autoethnographic_paper_example.pdf
    • https://s3.amazonaws.com/pidufozu/mavimopi.pdf
    • https://s3.amazonaws.com/dogazisuze/22498518994.pdf
    • https://s3.amazonaws.com/henghuili-files/adobe_acrobat_reader_indir_gezginler.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_off0000a6be.bin
75147a72d214e3f042b287c4e6918c94f5892e63e5ce8678e7ba57dffb6cf5db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6BE 5508 bytes
font_01_sfnt_off0000b96a.bin
9f662987d9a1155342f70dd0fe6ce570e9538435d5efbd037e21f00bb022c81d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB96A 9708 bytes

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