Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb781866e80fd6e…

MALICIOUS

PDF

42.4 KB Created: 2021-05-02 08:19:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0e7510b528e0f530042bd3841035ae76 SHA-1: e6b6ec872fe718ad47aee2e828a27ce42306e5e7 SHA-256: 3bb781866e80fd6e9a65ba321460ad8ab298c6a791dffcdcc39b6a0ffd6dfb3d
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one identified as a malicious redirector. The document body and heuristics indicate a lure related to 'free stuff on Roblox' and 'game hacks', suggesting a phishing or scam attempt. The presence of embedded URLs and the nature of the lure strongly suggest an attempt to redirect the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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-to-get-free-stuff-on-roblox-2021-mobile-game-hack In PDF document text
    • https://lib.stie-yai.ac.id/repository/robux-kaufen-free.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/hackear-roblox-escape-prison.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-do-you-get-builders-club-on-roblox-for-free.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-skin-on-strucid-in-roblox-how-to-get-i.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-admin-hack-best-script.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/robux-gratis-2021-hack.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-exploit-with-cheat-engine-in-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-hack-others-account-in-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-free-robux-legit.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/hacking-tool-roblox-pastebin.pdfIn PDF document text
    • https://freerobux.cyouIn 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
stream_003_off00004416.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4416 27120 bytes
SHA-256: 77cfc9f6c405533bbea5419ee660c6e218d070eacac19897da8acade51090343
font_01_sfnt_off0000818c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x818C 19072 bytes
SHA-256: aeb685af7d3126555c6f4f11055a0304e94a2109169941b3aace160bfe15f96d

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