Malicious PDF — malware analysis report

Static analysis result for SHA-256 4881757abb05b6d4…

MALICIOUS

PDF

37.8 KB Created: 2021-07-03 14:56:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6faac771cf01659af7f0dd85c8a7bc38 SHA-1: 6677678072df043ec7aa4511c4389899ed18e990 SHA-256: 4881757abb05b6d4589f4158e9902cb3eb3d7c6df8d04765a56e87dce3bbd5c8
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a prominent link disguised as a game hack generator, directly linking to a URL associated with malicious activity. The document body and heuristics confirm the lure is for game hacks, specifically mentioning Coin Master and Roblox, and points to the URL http://netcdn.tw/app/406889139/coin-master-online-hack-link-game-hack. This suggests the primary goal is to trick users into visiting a potentially malicious site for cheats or exploits.

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 http://netcdn.tw/app/406889139/coin-master-online-hack-link-game-hack PDF link annotation
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-hackear-ordenadores_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/robux-hack-no-game-download_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-avatar-the-last-air-bender-lvevl-hack_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-cloathes-in-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-free-mighty-lion-card_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/dailyrobux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/daily-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-make-a-hacker-game-in-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/hack-para-atravesar-paredes-en-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-generator-no-survey-no-verification_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33B0 23172 bytes
SHA-256: 8e044946f9b81627c090b845bd28e883f14f781adcd563a93886bc464dc4c57f
font_01_sfnt_off000067cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67CB 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off000071b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B0 18080 bytes
SHA-256: fae27d4c4c2e952e6b547115e62f69cc1ea43df316298c73a3448a7f0ad6854c

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