Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b24a1e8bbc94e21…

MALICIOUS

PDF

34.9 KB Created: 2021-06-24 12:29:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8be8ef6e00a3588e7a53e1c1da72b31f SHA-1: e2ce35f9dc41297a78c0be85d615cd48a004f1d0 SHA-256: 4b24a1e8bbc94e2189ac4cb34ee295d4c23d57a074a4dc70ae68af58cbbef7f4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a lure for 'free Robux' and 'game hacks'. The document body and embedded URLs reinforce this theme, directing users to potentially malicious websites. While no scripts were extracted, the primary function appears to be social engineering users into visiting a malicious URL, likely for further exploitation or scamming.

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/free-robux-human-verification-game-hack In PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-easy-on-tablet_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-c9m_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-shield-hack_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-generator-free_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/completed-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-shirt-templates_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/gg-hack-client-roblox_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-free-app_GM479516143.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-the-free-dragon-wings-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/hacks-for-coin-master_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_off00003161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3161 22268 bytes
SHA-256: fd2d6e258c55225fb602865bf3bdbda6dd54e5a52c0b640cb1a30a9a5c3e471f
font_01_sfnt_off000062ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CA 19336 bytes
SHA-256: 92143470d310579c388343173be6cd05412756600998301cf9713c298b7be504

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