Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8dd6264970a37a3…

MALICIOUS

PDF

68.4 KB Created: 2020-11-24 08:33:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7680400776d4514ab20828b71f2095d SHA-1: d3ad3c4031b539c461cf343d67b0f59fad35e01e SHA-256: f8dd6264970a37a328b495d975bd4611a77d8799fe59d486dcd5c8972cfbc37e
162 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 'traffmen.ru'. This, combined with ML classification and ClamAV detection, strongly indicates malicious intent. The document body, though heavily obfuscated, contains text related to 'Chsl answer key qmaths', suggesting a lure to entice users to click the malicious link for a fake download or information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/aws?utm_term=chsl+answer+key+qmaths
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/8142125.pdf
    • https://cdn-cms.f-static.net/uploads/4389823/normal_5fa1fa829bedd.pdf
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/79bae59ef29.pdf
    • https://cdn-cms.f-static.net/uploads/4402938/normal_5faf8a8f1a5d1.pdf
    • https://ragulifogikub.weebly.com/uploads/1/3/3/9/133986704/bofanilatenubu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nitirew/biriliwireketuporabaf.pdf
    • https://s3.amazonaws.com/netinuwa/bumidapegamiradegakozuvex.pdf
    • https://uploads.strikinglycdn.com/files/79ba724e-493b-400a-b663-90752100a0d0/12_week_muscle_building_program_kris.pdf
    • https://uploads.strikinglycdn.com/files/95c1eb86-56c6-4b07-a4c0-79158a9e0149/ruxegugexuruvijajelidomim.pdf
    • https://s3.amazonaws.com/zuponefi/cf_auto_root.pdf
    • https://uploads.strikinglycdn.com/files/1ceb288b-d9f5-456d-968d-b19b84c21ca4/posowo.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e2ec.bin
3793181c7c6c3aace6b4ea83413f0aed715665a0ef70c29d80f390d42acaf616
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE2EC 19956 bytes
font_00_sfnt_off0000ac6e.bin
c801e9958fd864cc34d75547cc3a26d5e0c6cce10fd20a08a7d2537a7487bf3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6E 5212 bytes
font_01_sfnt_off0000be11.bin
8759dc1b893141ba403a9526de464868460ef37ebe173ee3263f5359bb953366
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE11 10772 bytes