Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab74c3df9897cc0f…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 16:38:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5af1920ed6887faad31d2e8ff78ba1eb SHA-1: 97a32eae791995b548290fe543212bd71f1c5d8b SHA-256: ab74c3df9897cc0f3197f75481cd7011f5c30a0298285a8e1d0f3c92fc456579
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.tw/app/431946152/how-to-get-more-robux-for-free-game-hack PDF link annotation
    • http://kumotor.com.tw/upload/userfiles/files/coin-blogspot_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/omg-insane-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/800-robux-for-free-gamekit_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-admin-3-apartments-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-hats-and-gear-on-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/city-17-roblox-token-hack_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-speed-hack-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/escape-are-51-roblox-how-to-free-the-dead-alien_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-minion-game-hacked_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/hack-coin-master-apk-358_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/earn-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-hack-a-roblox-account-quick_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_off000031a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A7 22356 bytes
SHA-256: d26cd5ae8b4120cbc94db23622b6701dad6aa02aca5a690c111c22ed632ebe5d
font_01_sfnt_off00006367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6367 19180 bytes
SHA-256: 2bff2d2121057f006b71b066e94fd010776662c2bbd91426c2b13817cbe3f110

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