Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39b66868b4186c6…

MALICIOUS

PDF

35.9 KB Created: 2021-06-19 04:59:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 31ae80e353a3bd3e1b274045ea6784fc SHA-1: b52eb1819af15dc342fc94590735a897d23d3fa9 SHA-256: e39b66868b4186c6273de5f8074f8c612d618ee0413bc115298e44fa438b6ef1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising game hacks and free items for popular games like Roblox. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links indicates an attempt to lead the user to malicious websites. No scripts were extracted, but the document's structure and embedded URLs suggest a lure for further malicious activity, likely involving drive-by downloads or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/roblox-tampermonkey-hack-game-hack In PDF document text
    • http://medinup.pt/images/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/heroes-online-roblox_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/how-do-you-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/how-to-have-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/how-2-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/roblox-hack-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/hack-roblox-money-cheat-engine-60_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/free-gaming-like-roblox_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/mad-city-cheat-roblox-kill-all_GM431946152.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_off00003390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3390 23064 bytes
SHA-256: 7347b4e9ff5b8e765ddfcd3b909f82d17eabdd237218e8c305915c4f90d0a082
font_01_sfnt_off00006733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6733 19088 bytes
SHA-256: 6c7c5c56625b9d18676dceffe7e2ea38ccd9aa9c260cc89d2711e09e69d645ed

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