Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b8a904e168c5c6…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 22:30:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 562ab078b341131deb62a8bb147a2086 SHA-1: 8fd5253b1bfebf487240806862b5b5e32e42a843 SHA-256: b9b8a904e168c5c6819fb90192bdfeec4b33c121df3469ff84947e1c0028b99f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains multiple links to known malicious redirector infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games. The primary lure directs users to http://netcdn.tw/app/406889139/coinmasterfreespins-game-hack, which is flagged as a malicious redirector. This suggests the document is designed to trick users into visiting potentially harmful sites, likely for further malware delivery 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.tw/app/406889139/coinmasterfreespins-game-hack In PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/robux-free-roblox-generator_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/knife-server-roblox-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/robux-mony-free_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/roblox-free-members_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/coin-master-spin-hack-link_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/descargar-hack-roblox-sin-virus_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/the-best-free-hacking-tool-for-roblox_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/how-do-you-get-money-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-girl-account-roblox_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/client-minecraft_GM479516143.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/how-to-hack-on-roblox-murder_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/earnrobux-gg-earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-aimbot-cbro-roblox_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/boku-no-roblox-hack_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
stream_002_off0000322a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x322A 22212 bytes
SHA-256: 7a098baef4006e42af6978f76a2221a60a3baeea06df9fbe5840abefd281e983
font_01_sfnt_off00006324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6324 18272 bytes
SHA-256: 07d1048110b648044dfdf05b80b578e3dafb2e438d2dd29495699789e7328ffb

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