Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8cc7cfcea0585f…

MALICIOUS

PDF

43.9 KB Created: 2021-05-20 23:07:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7a116c652af788df6926f869c80689b3 SHA-1: 3cfb6c472f31bc525bc06eac457fb1cdb50fa674 SHA-256: 9c8cc7cfcea0585f9d7a0962878280c3595e3952c0616115b95cb7e8e3d64e65
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and embedded URLs that lead to websites offering game cheats and in-game currency, such as Robux. The ML classifier also flagged this PDF as malicious. The presence of these elements suggests the document is designed to trick users into visiting malicious sites, likely to download further malware or engage in scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7970

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.xyz/app/431946152/claim-gg-free-robux-game-hack
    • https://www.pswpallets.com/uploaded_files/userfiles/files/coin-master-200-spin-link_GM406889139.pdf
    • https://www.pswpallets.com/uploaded_files/userfiles/files/how-to-get-free-robux-app_GM431946152.pdf
    • https://www.pswpallets.com/uploaded_files/userfiles/files/hacks-for-roblox-jailbreak_GM431946152.pdf
    • https://www.pswpallets.com/uploaded_files/userfiles/files/coin-master-free-spins-a2z-help_GM406889139.pdf
    • https://www.pswpallets.com/uploaded_files/userfiles/files/minecraft-hack-mod_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032c5.bin
ca36e6ef8e35ae7c70987d3921b4a84e6f94514adebadc422a52baa7cec81096		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32C5 35272 bytes
font_01_sfnt_off00007f06.bin
972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F06 2820 bytes
font_02_sfnt_off000088a5.bin
f4ec7cc5ac7357ae04b81b01f4f60b03f50baf34e575c591e7a4d82bee829dbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88A5 18984 bytes

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