Malicious PDF — malware analysis report

Static analysis result for SHA-256 a935c9404351e3b4…

MALICIOUS

PDF

35.1 KB Created: 2021-06-19 10:21:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a8ba27a32140fa04b9233e028313a896 SHA-1: b96b91c56c0083b4094bf50ffee52e1004df5874 SHA-256: a935c9404351e3b454fdf9a3253a9bcdeb91e021bf66f8ac3e90dca26f0ef284
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a clear lure for a 'Coin Master Hack' and embeds a link that redirects to a known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves tricking the user into visiting a malicious URL under the guise of obtaining game cheats.

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.co/app/406889139/coin-master-hack-apk-no-survey-game-hack In PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/robloxs-top-model-hack_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/como-hackear-cuentas-de-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/tiktok-free-song_GM835599320.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/wurst-client_GM479516143.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/real-working-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/win-free-robux_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-spin-generator_GM406889139.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
font_00_sfnt_off00003404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3404 22360 bytes
SHA-256: 1f054aa8aed54ec1d4d74b712ef4ef9c27ddaca666b15456afd1ecc829135fe2
font_01_sfnt_off0000655a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x655A 18612 bytes
SHA-256: ea471364580b19b0a285475b4c0f13c806daaecf8552f4a25a80e6b014191c7c

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