Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9b0c78631b102e…

MALICIOUS

PDF

63.9 KB Created: 2020-12-27 05:57:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b137cb506631c509fe8dab6a2dde4803 SHA-1: dc3666b27c12ab3f9385a1d5e7ca50f680b50682 SHA-256: bc9b0c78631b102e3cb0bbb51996a088be6f56c11959b0085701f27c4ceb59b9
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=geometry+dash+demon+gauntlet+on+scratch'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=geometry+dash+demon+gauntlet+on+scratch In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_5f9f294a2012b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451754/normal_5fa0e25054e57.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/hciUWkU/hungry_shark_game_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/filumabit/Njigcij/ice_in_case_of_emergency_app_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476569/normal_5fabbb259087d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5f9f81796eb8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_5f9eb7b0213d1.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawifen/cgdqhcv/49193667800.pdfIn PDF document text
    • https://gejovekozeja.weebly.com/uploads/1/3/4/4/134401956/5077810.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/6d5e5a68-d24e-4f3b-9cae-296c3e15755d/es_file_explorer_apk_ios.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_off0000b887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB887 5488 bytes
SHA-256: 465a49d4f78cffe195fd2f7b12a37d96440c2024ee48e7dc6658763673305082
font_01_sfnt_off0000cb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0E 11736 bytes
SHA-256: b6aab1adc27c434137bb08d024b40efbc62dbe21822cdead0440fe3a828a136d