Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d6d4e60773875b…

MALICIOUS

PDF

35.1 KB Created: 2021-07-06 11:35:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 75b0dff9446b77603b549baccb9c497c SHA-1: 907e5fd054ec5c6b0f03f1ee5b522e7818c1b811 SHA-256: c6d6d4e60773875bf1cdf19432c84b33bd638204fa849ee9113676c7e4b496b3
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a lure related to 'free Robux' and game hacks, directing users to external URLs. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the embedded URLs strongly suggest a social engineering tactic to trick users into visiting potentially malicious sites. The ML classifier also flagged this PDF as malicious with high confidence.

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/hey-google-how-do-you-get-free-robux-game-hack PDF link annotation
    • http://kumotor.com.tw/upload/userfiles/files/exploit-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/earn-free-robux-roblox-game_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/pubg-uc-2021_GM1330123889.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/adventure-story-hack-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-cheat-codes_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-full-spiderman-outfit-free-spiderman_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/tiktok-free-hearts-hack_GM835599320.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-roblox-rum_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/ggame-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-adopt-me-cheats-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-super-power-training-simulator-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/robux-hack-code-pastebin_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-look-like-a-wannabe-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-hack-a-roblox-account-easy_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_off00002f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F5F 22796 bytes
SHA-256: 1e6b006e7f339d9c8676d463c08939709337b238f83ab5fb79978ec39c6d7f39
font_01_sfnt_off00006283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6283 19568 bytes
SHA-256: c947cb9e4153dfb2ea198cd701ec4d5f338e29feb7802fd2debd87897cec7901

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