Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a60df2f5ef15a2…

MALICIOUS

PDF

78.2 KB Created: 2020-12-25 05:16:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2b7fd73dfd79232b473e7ec1ea48a79 SHA-1: 6c8bb46243f290a19515322b18aa630410c1bd49 SHA-256: 65a60df2f5ef15a2093f0f1758bab928023a965db477e2b5d45730cf79d4c84e
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=guitar+hero+rock+band'. This URL is likely used to lure users into a phishing or malware download site. The ML classifier also strongly flagged this PDF as malicious, supporting the redirector finding. No scripts were extracted, but the presence of a malicious URL is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=guitar+hero+rock+band
    • https://cdn-cms.f-static.net/uploads/4501654/normal_5fbb20c58dcd3.pdf
    • https://cdn-cms.f-static.net/uploads/4405202/normal_5f9688fed67ef.pdf
    • https://cdn.sqhk.co/jumifokujuje/S4Eq6ij/switched_at_birth_bay_assault_episode.pdf
    • https://cdn.sqhk.co/lisesemafo/h6jeF8N/new_ringtone_free_download_bollywood_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4490122/normal_5fba79c23cfe5.pdf
    • https://cdn-cms.f-static.net/uploads/4475397/normal_5fb803d771cb2.pdf
    • https://cdn-cms.f-static.net/uploads/4492875/normal_5fad6e34bbf8d.pdf
    • https://static.s123-cdn-static.com/uploads/4486965/normal_5fe13567dc300.pdf
    • https://cdn-cms.f-static.net/uploads/4413467/normal_5f981985ead75.pdf
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5fd822a1cea4b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a0d2cf02-cd14-42c2-b97d-ecf3e2909674/89051507687.pdf
    • https://s3.amazonaws.com/fujadabez/charlie_weasley_gobstones_answers.pdf
    • https://uploads.strikinglycdn.com/files/fc745f43-94a8-4a3b-a3f2-9012524d67c7/large_light_up_full_length_mirror.pdf
    • https://s3.amazonaws.com/jolituzoji/bacteria_endospore.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_off0000f698.bin
92b092b908ddce58234e24599b874f9a577713a3f77f261987bcb29ddf59ea5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 5052 bytes
font_01_sfnt_off000107bf.bin
c39ec0947bbb3f4de753b08d1d7754f9ad2af1cee0f88aee168ab976dbf1da90
pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 10872 bytes