Malicious PDF — malware analysis report

Static analysis result for SHA-256 478a1cbf16c06566…

MALICIOUS

PDF

49.7 KB Created: 2021-06-09 14:53:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-20
MD5: ec9b55ae138c2daf4323c60cafec4d9c SHA-1: ff1cae12c2f7fd0c6bdc1656e094fd3e8ab20088 SHA-256: 478a1cbf16c06566fa04c4cf1a0dbf738762b2557097f401a7892e2fd2b359f2
160 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/fencing-reach-hack-roblox-game-hack In PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-fly-hack-cheat-engine-on-mac_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-item-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/irobux-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/robuxmatchcon_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/welcome-to-robloxwin-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robuxrar_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/microsoft-roblox-rewards_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-roblox-robux-2021_GM431946152.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_off000050c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C7 27512 bytes
SHA-256: 0e758815f0dc81922322ca7d41749b960670a5d1a07dffc9f38d8efc74a2b632
font_01_sfnt_off0000913c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x913C 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DE4 18920 bytes
SHA-256: 91c78c359db33cb051ffff317f5a7f86133d005f7c1698aa03597ea806ec893f