Malicious PDF — malware analysis report

Static analysis result for SHA-256 a593b013dc01fba6…

MALICIOUS

PDF

66.9 KB Created: 2020-12-26 21:33:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7d55318fe5bae8d2767731f198ab959 SHA-1: d162f53c3a5c073bab51c591f19d7bd37ca6141a SHA-256: a593b013dc01fba6697b5b023058ffb2ea134f91913fefcdb4bb936cd4f11311
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 'https://cctraff.ru/strik?utm_term=farkle+minkus+actor'. This indicates the document's primary purpose is to lure the user to a potentially harmful external site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cctraff.ru/strik?utm_term=farkle+minkus+actor
    • https://cdn-cms.f-static.net/uploads/4370543/normal_5fd7a41593be6.pdf
    • https://cdn.sqhk.co/xugikokazo/g7tiicf/75203185853.pdf
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/3554631.pdf
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5f89d226b56e2.pdf
    • https://vaputonusodi.weebly.com/uploads/1/3/4/4/134493057/pupesofoxanepek-zevofaw.pdf
    • https://static.s123-cdn-static.com/uploads/4476952/normal_5fe2dea1070da.pdf
    • https://cdn-cms.f-static.net/uploads/4374376/normal_5fb5bf82019f7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jepavilutabilel/add_chart_to_sheet_excel_vba.pdf
    • https://s3.amazonaws.com/timafatafej/html_form_picklist.pdf
    • https://s3.amazonaws.com/nopomewegobij/24333542641.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_off0000c8a4.bin
28d67e1e30e4c0096c4c11bb6faf30f73e8b5f86eca76ddaf32050ffdca67702		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A4 4964 bytes
font_01_sfnt_off0000d970.bin
e22aa013c3e1fd924607965a3b4dc793711a385a691117f5416b11ebd7bb32c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 11252 bytes

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