Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fc7c6a2ec3a364…

MALICIOUS

PDF

42.9 KB Created: 2021-06-08 15:11:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9cca2bbeb173fa74581c75eb91b5631f SHA-1: d34dcefbfba2ae0ec8afbec06f53b2fe6de244d3 SHA-256: 70fc7c6a2ec3a3647db4adc58136cd7a308ad59ce494e8d7490e7bbed7bc9d22
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick the user into interacting with it, which is a common social engineering tactic. It contains multiple embedded URLs that likely lead to the download of a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/xsos-hack-roblox-game-hack
    • http://gruporamos.do/images/earn-robux-today_GM431946152.pdf
    • http://gruporamos.do/images/free-coin-and-spin-for-coin-master_GM406889139.pdf
    • http://gruporamos.do/images/free-roblox-card-codes-list_GM431946152.pdf
    • http://gruporamos.do/images/huskybuscom-free-robux_GM431946152.pdf
    • http://gruporamos.do/images/free-robux-generator-no-verification_GM431946152.pdf
    • http://gruporamos.do/images/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdf
    • http://gruporamos.do/images/coin-master-facebook-hack_GM406889139.pdf
    • http://gruporamos.do/images/is-roblox-hacked_GM431946152.pdf
    • http://gruporamos.do/images/basic-roblox-lua-programming-free_GM431946152.pdf
    • http://gruporamos.do/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdf
    • http://gruporamos.do/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://gruporamos.do/images/coin-master-free-spin-and-coins-links_GM406889139.pdf
    • http://gruporamos.do/images/robux-free-c_GM431946152.pdf
    • http://gruporamos.do/images/free-spin-coin-master-2021_GM406889139.pdf
    • http://gruporamos.do/images/real-coin-master-hack_GM406889139.pdf
    • http://gruporamos.do/images/claim-free-spins-coin-master_GM406889139.pdf
    • http://gruporamos.do/images/free-robux-live_GM431946152.pdf
    • http://gruporamos.do/images/free-unlimited-coin-master-400-spin-link_GM406889139.pdf
    • http://gruporamos.do/images/how-to-get-minecraft-realms-for-free_GM479516143.pdf
    • http://gruporamos.do/images/minecraft-for-chromebook-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d6d.bin
84a5e202178bc1ccc720475de07cf44e6c49b1dc75c3893586f68a5523306033		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D6D 24364 bytes
font_01_sfnt_off0000853c.bin
69a47deb7e3305e89c5caf6ca777446dbe6acdeda0ed88e952e944fd8c2fd619		 pdf-font-stream PDF embedded font (sfnt) at offset 0x853C 18184 bytes

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