Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa85d9a992d0103…

MALICIOUS

PDF

34.6 KB Created: 2021-06-20 02:57:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ce8da3adf96698af327a26cfa12daa5b SHA-1: 84c725e2f48334a1113aa2e7f9d98dffceb55b3e SHA-256: 9fa85d9a992d0103a192ef184e8babd2e00b63ed503e5103a0cdd3000f16e666
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-hack-us-game-hack PDF link annotation
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/coin-master-online-hack-no-survey-no-password_GM406889139.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/coin-game_GM406889139.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/free-robux-real_GM431946152.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/how-to-put-a-roblox-hack-in_GM431946152.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-2021-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://www.hendrejuniorschool.co.uk/admin/ckfinder/userfiles/files/is-there-a-free-version-of-minecraft_GM479516143.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_off000030d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D4 22484 bytes
SHA-256: e0b9cc6769925d77387d5d75fe26d63d2d0cfc7cd194b39c892e037c9e7bb808
font_01_sfnt_off000062ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62AC 18884 bytes
SHA-256: bfc674629a4fdfc233a3c1a19cbee54387e60bd0cdfc4a3107778b42d9fa82d8

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