Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc49f44d02311668…

MALICIOUS

PDF

47.8 KB Created: 2021-06-02 14:58:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a2a16ed89f8881cffbe1618c89407581 SHA-1: df4fe46a954f26bf7f3ea8c1bc5d7d6b6a841897 SHA-256: fc49f44d023116684887d91af2061e01553bb5ab2363b07041d64590860fe747
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA lure to trick users into interacting with malicious links, as indicated by the SE_FAKE_CAPTCHA heuristic. The embedded URLs, such as https://netcdn.xyz/app/431946152/free-admin-codes-2021-roblox-game-hack, likely lead to the download of a second-stage payload. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/free-admin-codes-2021-roblox-game-hack
    • http://shiny-nn.ru/images/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://shiny-nn.ru/images/free-college-textbooks-tiktok_GM835599320.pdf
    • http://shiny-nn.ru/images/coin-master-daily-link_GM406889139.pdf
    • http://shiny-nn.ru/images/robux-hack-me_GM431946152.pdf
    • http://shiny-nn.ru/images/free-minecraft-bedrock-server_GM479516143.pdf
    • http://shiny-nn.ru/images/roblox-promo-codes-for-free-robux_GM431946152.pdf
    • http://shiny-nn.ru/images/free-minecraft-for-kids_GM479516143.pdf
    • http://shiny-nn.ru/images/coin-master-cards_GM406889139.pdf
    • http://shiny-nn.ru/images/collect-free-spins-for-coin-master_GM406889139.pdf
    • http://shiny-nn.ru/images/free-robux-codes-no-verification-2021_GM431946152.pdf
    • http://shiny-nn.ru/images/microsoft-store-robux_GM431946152.pdf
    • http://shiny-nn.ru/images/how-to-hack-someones-roblox-account_GM431946152.pdf
    • http://shiny-nn.ru/images/free-robux-quiz_GM431946152.pdf
    • http://shiny-nn.ru/images/robux-hacks-2021_GM431946152.pdf
    • http://shiny-nn.ru/images/get-free-spins-on-coin-master_GM406889139.pdf
    • http://shiny-nn.ru/images/free-robux-youtube_GM431946152.pdf
    • http://shiny-nn.ru/images/minecraft-free-play-no-download_GM479516143.pdf
    • http://shiny-nn.ru/images/roblox-zone-free-robux_GM431946152.pdf
    • http://shiny-nn.ru/images/how-to-get-free-robux-gift-cards_GM431946152.pdf
    • http://shiny-nn.ru/images/roblox-free-hair-boy_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050d2.bin
9f1aa9b314b42478a02118318c3acb3e7b48511144b32e01f6e284515573f2ec		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D2 25772 bytes
font_01_sfnt_off00008c80.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C80 2880 bytes
font_02_sfnt_off0000966b.bin
5bbedfc8febcd19bee07ad6ef8ace8a3a91790d414ed1b3ccab18110a8cb594e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x966B 18904 bytes

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