Malicious PDF — malware analysis report

Static analysis result for SHA-256 403e4f01e7f941c2…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 06:55:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b9e765c29c8e7014bedb235980225306 SHA-1: 41f13b995f8ce5384bce511b3487a7b82d90752a SHA-256: 403e4f01e7f941c2dbb8a57f8c58b1ee1e59bbe678c27a854f6c76a21316d976
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on a "free generator / game hack" URL. The primary malicious link, http://netcdn.tw/app/431946152/free-robux-real-2021-game-hack, is hosted on known malicious redirector infrastructure. The document body and embedded links strongly suggest a phishing or scam attempt related to in-game currency. No scripts were extracted, but the presence of malicious links and the lure indicate a high likelihood of user redirection to a malicious site.

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.tw/app/431946152/free-robux-real-2021-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/best-free-roblox-items-2021_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-do-you-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/2021-how-to-make-a-free-group-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/fun-games-to-hack-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/add-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/jump-hack-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/is-coin-master-hacks-safe_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/real-minecraft-for-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_off00002f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F17 22760 bytes
SHA-256: 94d88ffac3a9d06a612f3abbf28ad2902fd227ece337eb6fe4d6e63f21bea956
font_01_sfnt_off0000623b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x623B 19192 bytes
SHA-256: 0a56f38ee828cc338b4ecf6fd69a1c4ab782641ccce74c835442ee7dbad06135

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