Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab6544fabce1f88…

MALICIOUS

PDF

40.0 KB Created: 2021-05-24 03:54:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a7b939613492448a477c075be1bb6fc3 SHA-1: 2702516015a9b9d7652d8b9d4f0931bb67b74fe3 SHA-256: fab6544fabce1f88e0103e130b7e496b8d6f982c8fcf1ad6f40165aced4220b2
82 Risk Score

Malware Insights

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

The PDF document contains a lure for 'Free Robux' and displays a fake CAPTCHA to trick the user into interacting with it. It embeds multiple URLs, including one pointing to a suspicious domain that likely hosts a malicious payload or redirects to a phishing site. The document's content and heuristics suggest an attempt to exploit user interest in in-game currency to drive them to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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-robux-without-human-verification-game-hack PDF link annotation
    • http://dismarinamt.com.br/images/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • https://www.bandicam.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000030f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30F9 25672 bytes
SHA-256: eebb09f70c28197237456254d7e6b0e7d71f044612d2108374b2f5a7cd01cbaf
font_01_sfnt_off00006ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE4 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off0000780d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x780D 19224 bytes
SHA-256: 69162c0303826e3a88150cee7b6b12b50ba56e04bc46253c0e5eb9f80ac8a399

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