Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9641ac2321e4d78…

MALICIOUS

PDF

35.4 KB Created: 2021-06-19 15:34:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5d0443f781ca4132e353b641108b8e78 SHA-1: e499b63bb0019c72d0312a5e714e11e5a6c56806 SHA-256: f9641ac2321e4d7898cd1b153abca559b11301515870ff1ba076737eb66365e1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body and embedded URLs reinforce this, advertising 'Roblox Hack Unlimited Robux' and linking to a suspicious domain. While no scripts were extracted, the overall pattern suggests a phishing attempt designed to redirect users to a potentially harmful site.

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/431946152/roblox-hack-unlimited-robux-game-hack In PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-tiktok-views-no-verification_GM835599320.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/easy-robux-com_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/chisel-and-bits-mod-pe_GM479516143.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-gear_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/hack-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/how-do-i-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3132 22804 bytes
SHA-256: 6eb5f00e20027650c035322455cb79734d166047ae0d4eb9a17856d43192ac06
font_01_sfnt_off0000643b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643B 19452 bytes
SHA-256: c21e99ebfc9f7e5f39e71a68abf279300e15561c35a4934f0c8f70bb34e99d3b

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