Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaca39078ef9dd59…

MALICIOUS

PDF

113.1 KB Created: 2020-11-25 00:52:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a6a6368b331095f4fffbffb157796097 SHA-1: 1d5586784042de3f7e0017b079dd95b00540878f SHA-256: aaca39078ef9dd5998f9c7ec4a80dfbbbd99ba7d97e54deb8db9b80876d8b358
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=ffx+mix+guide'. ML classification and ClamAV also flagged this file as malicious. The embedded URL suggests an attempt to lure the user to a malicious site, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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=ffx+mix+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f870ba8e7457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5fa02ce612c0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471252/normal_5fbadb1c73d6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f899c3695022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455658/normal_5fbd87808f15d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5f93a9de8cda9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_5fbd55819c874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402706/normal_5fa6c67f8c15d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/memul/american_english_file_2_test.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/gadozifiz.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/afrikaans_to_english_translator_app.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/strahds_animated_armor_5e.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/sat_2_answer_sheet.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_off00018209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18209 4732 bytes
SHA-256: 47a160f1ce0c56b3498e0f035a29c388e1eca17f99848efd0538ac7256a7268f
font_01_sfnt_off00019224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19224 11300 bytes
SHA-256: 078245171401b7d95852727ec9f9ae57a1b4ebef83208516d01ca0bf5e7113d2