Malicious PDF — malware analysis report

Static analysis result for SHA-256 99378b9c89527df1…

MALICIOUS

PDF

46.8 KB Created: 2021-06-09 04:53:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 364a3a7cc16badc833ace875445fc625 SHA-1: df6f1cf8117e0072fa138ac4294f8d68b5f29e1f SHA-256: 99378b9c89527df1e84524715c4b1181932ee6dee12024fc5b415ee676b3bfa3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising "free Robux" or "game hacks" to lure victims. The primary redirector URL is https://netcdn.tw/app/431946152/free-robux-only-username-and-password-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristics indicate it's designed to exploit user interest in free in-game currency or cheats, leading them to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.tw/app/431946152/free-robux-only-username-and-password-game-hack In PDF document text
    • http://neltalen.nl/images/coun-master_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/oprewards-com-login_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://neltalen.nl/images/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/earn-free-robux-roblox-game_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-hack-tool-pc_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-headless-horseman-free_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/free-roblox-catalog-2021_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-hack-tips_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://neltalen.nl/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/how-to-get-free-robux-easy-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004db0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DB0 24924 bytes
SHA-256: a5d59ecadbda3ff942aebd010bb0d5163af59cb32a072dec481e79c098c005e4
font_01_sfnt_off0000864d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x864D 2984 bytes
SHA-256: 2df87bbe4e27b27e34c872c092d0522acd977d05f5cbde7ed5e1fdfeb59cb318
font_02_sfnt_off0000909b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x909B 19432 bytes
SHA-256: fe55ef0c4cd3244f02f8a21b6c42ac93222b7428919b45c0566f83ce16f09df1

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