Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7a2443cb23ab25…

MALICIOUS

PDF

36.3 KB Created: 2021-05-21 17:01:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 494dc09debf7347f71896114aa702e6e SHA-1: d235327361d307b8744c85c912e6481a6bef4489 SHA-256: 5a7a2443cb23ab2580231fd221b58e9174fafb6a03aaf6af09a15ef7f4faf6a4
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA and a download lure, aiming to trick the user into downloading a secondary payload. It embeds multiple URLs, including one pointing to a file named 'minecraft-building-hacks-game-hack', suggesting a social engineering tactic to encourage downloads. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/479516143/minecraft-building-hacks-game-hack PDF link annotation
    • https://sitecontabil.com.br/ckfinder/userfiles/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/tiktok-free-save_GM835599320.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/win-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003307.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3307 25164 bytes
SHA-256: 1d0b171f0a8c7b94c17ad95f0d75fd523d1e80740c601de264265c8a4a78adc6
font_01_sfnt_off00006bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBF 18628 bytes
SHA-256: 03be4b6b10a4c687c6c89c16a3bf013511456428a76c01e3ee63370f4522cf94

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