Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efd006dc67f6e97…

MALICIOUS

PDF

34.5 KB Created: 2021-06-22 07:44:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7d553f9adf9206acc7f130addc2c80d2 SHA-1: 92c60e9d00089a97390da0fa23cce0ad9a5eacac SHA-256: 8efd006dc67f6e9701251941f6c1a3a2829a9cbd22882923e6d27973fd5ff5af
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file 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

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-free-body-game-hack PDF link annotation
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-for-android_GM406889139.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-forest-free_GM431946152.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-twisted-murderer-hack-nopde-engine_GM431946152.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/youtube-free-robux-november-13-2021_GM431946152.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/wwwcoin-master-free-spincom_GM406889139.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/http-bit-ly-coin-master-hack_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_off0000323b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x323B 21696 bytes
SHA-256: 64c9a8d4b862fd4c82be60aaa2844ac9d80a2617fb259faed379885da67c565a
font_01_sfnt_off000061e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E6 19004 bytes
SHA-256: 00d76505c5d5d340f2af2994da5646750aa23f2ea04bc02496aab4ee0fa4eed0

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