Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75dd9f98cef8bc4…

MALICIOUS

PDF

34.9 KB Created: 2021-06-24 20:38:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 67c0866b2919dc83f86c6333da153689 SHA-1: 6e53dc5b75a2ec7c31b2f12a10a9d86d7df3ff6f SHA-256: b75dd9f98cef8bc45e3fd9495be87f6e0af1c0a0c1590554f6740d8e7a403bee
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 4

  • 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/microsoft-store-robux-game-hack PDF link annotation
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-free-android_GM479516143.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-apk-oct-18-2021_GM431946152.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/earn-free-robux-roblox-game_GM431946152.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-gift-link_GM406889139.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/getrobux-now_GM431946152.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-a-profile-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.longford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-daily_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_off000031e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31E2 22324 bytes
SHA-256: 22130667afc4a4929f37d60dbe55f2f2636201dff57553e40c028f51110286ce
font_01_sfnt_off0000635f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635F 18972 bytes
SHA-256: 99e3af7f7228a133bb0caa35a407188509e92b0a09c57b0013d5f4a883a27c32

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