Malicious PDF — malware analysis report

Static analysis result for SHA-256 4257e90c3eca5ff6…

MALICIOUS

PDF

46.4 KB Created: 2021-05-13 11:47:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-15
MD5: 75edb531d5605d01cd8d158dbfd69b7a SHA-1: 87c1c8cf579a3f109092ab71db30c95859e1da09 SHA-256: 4257e90c3eca5ff68374f4bf72c27a0fb83c285b4b075494413cfb3aa63c670d
160 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/406889139/how-to-hack-coin-master-cheat-engine-game-hack In PDF document text
    • https://library.itn.ac.id/perpusitn/repository/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/coin-master-hack-tool-pc-download_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/coin-master-free-items_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/coin-master-rewards_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/coin-master-game-free_GM406889139.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_003_off00004d7b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D7B 26144 bytes
SHA-256: 65deb8735e50d436e97b7f2d169fafc1970898e192074a3023ca2c103661b9a2
font_01_sfnt_off000088d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88D6 2920 bytes
SHA-256: 601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
font_02_sfnt_off000092ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92EF 18332 bytes
SHA-256: 3a4ccd6cf68d04e1f61f192e0e505e5625435643e4a63e10a197213400e78cbb

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