Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cfa7c81e749a4d…

MALICIOUS

PDF

66.1 KB Created: 2020-12-11 02:52:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76f13cb5ac6efe84b5ff3f7d195de8a9 SHA-1: d097deab5b181f93b1d1c0bd8e3cbf4332e2e1ea SHA-256: b7cfa7c81e749a4dab059eeb845880ae529a273610822b1cdc31482f7eda8b3e
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 'https://gettraff.ru/aws?utm_term=four+features+of+a+spreadsheet+application'. This, combined with ML classification and ClamAV detection, strongly indicates malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs confirms the redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/aws?utm_term=four+features+of+a+spreadsheet+application
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9368ca39-9d14-49a9-8420-ec7c4604c5c2/37370310920.pdf
    • https://uploads.strikinglycdn.com/files/71a9a2ad-3d2f-4c8b-98e4-9ed28c1fa113/tektopia_villager_mod_wiki.pdf
    • https://s3.amazonaws.com/tosevud/46211157099.pdf
    • https://uploads.strikinglycdn.com/files/6343ee47-55a0-4b83-8e8d-c5dd6b794a9a/27139670265.pdf
    • https://uploads.strikinglycdn.com/files/b28041a2-309d-4431-8629-e3a193f7b949/xaladuwenuzetegepibob.pdf
    • https://static1.squarespace.com/static/5fc0c1ca2bbd74065805c248/t/5fc36f1a2dd96f591859f32c/1606643493369/10344913196.pdf
    • https://uploads.strikinglycdn.com/files/8d81663a-7e56-4e96-b16f-fe5c3c357bc8/76717507178.pdf
    • https://uploads.strikinglycdn.com/files/d9370573-27b0-4b6f-a2d0-7ce6973c6094/23759169518.pdf
    • https://uploads.strikinglycdn.com/files/d81285d6-23c6-425d-b966-06a5eef9b3fe/tous_unis_dans_l_esprit.pdf
    • https://uploads.strikinglycdn.com/files/cfc9e59b-aac2-4a13-b3ed-0efdb35b8f2b/fashy_hot_water_bottle_stopper.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_off0000c938.bin
f0c38f1028bc8a1068a171929040b3336bf154f1b5b92e830f4fd6e0a1158b5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC938 5196 bytes
font_01_sfnt_off0000dae2.bin
f19e76b38488317e1c9167fcbb850a380aec32b08f165a4ff8d888a9f192ecf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 9680 bytes