Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9817e897ad2d194…

MALICIOUS

PDF

44.8 KB Created: 2021-06-11 07:46:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 71f798c37a8fda19c99f02b2921761b2 SHA-1: af7892056ff3323703d7b40b72e99be638542317 SHA-256: f9817e897ad2d19461c8ff47d01787a4b06549c088ff2e21f22c31644a975b97
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure the user to a redirector hosting game hack content. The primary malicious link is https://netcdn.tw/app/431946152/best-roblox-free-skins-game-hack, which is flagged as a known malicious redirector. The document body and embedded URLs suggest a phishing attempt related to in-game currency or cheats. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/best-roblox-free-skins-game-hack In PDF document text
    • http://repository.ummy.ac.id/repository/how-to-hack-for-2021-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/robux-free-hack-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-cheat-codes-no-phone_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-robux-easy-robux-today_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-org_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-shirt-templates-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-spin-link_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/google-roblox-games_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/easy-points-gg_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-free-robux-generator_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_004_off0000505d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x505D 25780 bytes
SHA-256: f815ec1008e23597ad705f92fd36e9c4b32e067d707452a22935e8c85b99c7a9
font_01_sfnt_off00008c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C35 18344 bytes
SHA-256: cb2c81e2467eb992948ad891b2aff2bdf50097962f3400f4d01e3d614faff361

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