Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8afcb710e94d99…

MALICIOUS

PDF

54.1 KB Created: 2021-06-03 07:56:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6ba78e3a24e00ed534521085394d3f26 SHA-1: ba243f7c9210d92449ca7732a64b4ecdfe58a62f SHA-256: fc8afcb710e94d995cd54608f7b6c2af0ac2b0415753661d42f4f58ec27a2ea8
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 0.9886

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 https://netcdn.online/app/431946152/how-to-hack-roblox-ban-accounts-game-hack PDF link annotation
    • https://sparkthis.org/ckfinder/userfiles/files/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/app-master_GM406889139.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/free-robux-websites-that-actually-work_GM431946152.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_off00005ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE9 38784 bytes
SHA-256: de738c64deac49c831c4c4fa9847a4a0fd50d8769333de9a21bb6eda6c546ed3
font_01_sfnt_off0000b06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06D 18588 bytes
SHA-256: f5f755f9d5efa1687e6f6afbfdb2a00b2ace31801734da14af8a4a0fd97fb507

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