Malicious PDF — malware analysis report

Static analysis result for SHA-256 63517a4a7a40d387…

MALICIOUS

PDF

39.6 KB Created: 2021-05-21 14:07:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 72d8ab55d9417cc2f12952aa3a93bc0b SHA-1: 448315615d77c5b49e4eded8b87ec8e0459592cd SHA-256: 63517a4a7a40d3871c58921c3ece0fd3df079992c187d264d6ebbdf929a8d959
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document presents itself as a 'Roblox Robux Hack Generator' and displays a fake CAPTCHA, a common lure to trick users into clicking malicious links. The embedded URLs point to sites offering similar 'hacks', suggesting the document's purpose is to facilitate the download of further malware. No scripts were extracted, but the presence of external URIs and the fake CAPTCHA heuristic strongly indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8068

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/roblox-robux-hack-generator-game-hack
    • http://uo-nn.ru/images/robux-hack-no-verification_GM431946152.pdf
    • http://uo-nn.ru/images/how-to-get-minecraft-realms-for-free_GM479516143.pdf
    • http://uo-nn.ru/images/download-hack-coin-master_GM406889139.pdf
    • http://uo-nn.ru/images/minecraft-free-reddit_GM479516143.pdf
    • http://uo-nn.ru/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031eb.bin
34c2198818bb8bb05c03599305eac090b5b0d5a2eb36c7a93ee2ab1bcaf2cadd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31EB 24536 bytes
font_01_sfnt_off00006878.bin
ae114634718854704d615808d33fb1b747d90eb28e420080bd5adbdfe7fb6a27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6878 6700 bytes
font_02_sfnt_off000078b5.bin
bdac85b283ea9edec09d9f64e9cfc1f18bf7d6a92d05f58e23f3db2f02fbf028		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B5 18428 bytes

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