Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f403aab09668cf…

MALICIOUS

PDF

66.5 KB Created: 2020-12-16 03:59:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fd489530c2a8ba91afcb82d0791be664 SHA-1: 193965731776f1da8164c6d4942e2deffd4a5dfd SHA-256: 39f403aab09668cf254343e1a636a2bf1e0b0c630b4e34b78924500478bba672
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=expert+sphere+grid+guide'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL within the document body suggests an attempt to redirect the user to a harmful site, likely for phishing or to download further malware.

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=expert+sphere+grid+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408866/normal_5faa50d212cac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_5f8ed44ba8426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f86fc45d1b99.pdfIn PDF document text
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/6193297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5f91583ea01e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_5f9be46d8c527.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/daselex/example_of_adaptive_behavior.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc644b6c6d9645836469867/t/5fcb41ec8dcc5603bef15b9b/1607156205224/59258190445.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/xaroripokupowo.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/tweakbox_apk_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f73d1c8c741314321d77/t/5fcb8ba96fd93023bc06ec8c/1607175082597/magic_piano_mod_apk_2._9._7.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_off0000c85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85D 5004 bytes
SHA-256: 85b3a0404af27421dfa58d698a79d779f3b85b48ba632e030cec0594aec54b6f
font_01_sfnt_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 10692 bytes
SHA-256: bb6708ebfa3a1766420a0c4e02e450738751838b3e9e51e69920fc7333e1ae70

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