Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cef7fb162ef84a…

MALICIOUS

PDF

36.1 KB Created: 2021-05-25 08:37:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b5caacfc69186cbe8c62fe1f85e8c14f SHA-1: eb96aebbd9d39afabcc7abd89a2c16b7d61d4e78 SHA-256: 83cef7fb162ef84a86ad11a142c73aa29a798160856d62b178b017f05e032b88
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and known malicious infrastructure, specifically promoting 'free generators' and 'game hacks' to entice users. The document body and embedded links suggest a lure for potentially unwanted software or further malicious downloads. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://netcdn.xyz/app/431946152/how-can-you-get-free-robux-game-hack In PDF document text
    • http://lib.akper17.ac.id/repository/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-hack-lost-world-2021_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/minecraft-116-free_GM479516143.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_off0000310e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x310E 25284 bytes
SHA-256: 86578ce0e7fad3678792bc035cdd49613292a432df55302466e78de212b1ac14
font_01_sfnt_off00006a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A74 18672 bytes
SHA-256: b25769fe22a84510cbe545ecc77c61068e90e31ebb29fb78564d629eaf3a10b0

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