Malicious PDF — malware analysis report

Static analysis result for SHA-256 89dc8fa988b3cd2b…

MALICIOUS

PDF

47.9 KB Created: 2021-05-12 20:00:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c1883aa075768ac872390c77ccd6b509 SHA-1: 1c87500a3a91c22f5e60e3eed400c5f48299e37f SHA-256: 89dc8fa988b3cd2bf30147ec22dcd0ea77e82e716d7398d5dac6b60d2bd846b0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a prominent external URI pointing to a "coin master daily spin free game hack". The ML classifier also flagged this PDF as malicious. The presence of these links strongly suggests a social engineering attempt to direct the user to a potentially malicious website for game-related cheats, which could lead to malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/coin-master-daily-spin-free-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-download_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-2021-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-for-android_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-coin-master-android-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/hack-coin-master-32-mod-apk_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_off00004df3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DF3 31836 bytes
SHA-256: 3e087c87431795d13918a23aa203d43a42d67c1f67e8d877e793b130b615c966
font_01_sfnt_off00008f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4B 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000098fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98FC 18308 bytes
SHA-256: 213ea0fed5678e19eff32fcc5d46e69a4f1b73f67043b57a178cf12547108d4a

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