Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86f9d5f12388db6…

MALICIOUS

PDF

28.6 KB Created: 2021-07-19 00:07:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9421fde7af8812cf941a7328956a4eb7 SHA-1: 77bf4f439c5ebbcdca6529e55335cf7fecf5d864 SHA-256: b86f9d5f12388db68428ea3a03f5bbb0371e3d25a8f339a7e1045805438bedc6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure of free Robux and game hacks to entice users into clicking embedded links. The primary link directs to a known malicious redirector infrastructure, which likely serves as a gateway to further malicious content or exploits. The ML classifier also flagged this PDF as malicious, supporting the observed malicious redirection and lure tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7617

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • 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
  • 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 http://netcdn.tw/app/431946152/free-robux-come-game-hack In PDF document text
    • http://iedarelief.us/images/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://iedarelief.us/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F14 21232 bytes
SHA-256: 98aa06e386cbb752061bc0025bd19e7d645f62cd97d458088d273975a8bc4c4e
font_01_sfnt_off00004d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D5C 18460 bytes
SHA-256: cb195acd0f31ed4642a1120884106d6d6ad37130bbbf7ac9bb6f2a8b7761ddd2

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