Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd878ecfed8af98…

MALICIOUS

PDF

47.9 KB Created: 2021-05-16 18:01:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 64f8d2a487014344377148bbe9e140d5 SHA-1: 03b6d1a0c049c83e5aeff253bc72f9fc4201a299 SHA-256: bfd878ecfed8af98a03bb519a548aabc6bd9d5ba5e2573c3cc0fc07a5a7ef9b6
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into clicking a link. The primary external URI, https://netcdn.xyz/app/431946152/robux-for-kids-game-hack, is likely a lure for a malicious download. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/robux-for-kids-game-hack PDF link annotation
    • https://zszolesno.pl/images/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/free-robux-picture_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • https://zszolesno.pl/images/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
    • https://zszolesno.pl/images/united-gaming-net-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/master-coin-free-link_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://zszolesno.pl/images/blox-fish-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_003_off00004d7e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D7E 32312 bytes
SHA-256: 0e9ec5f2f6d35048eb3936f9635b86cc1f7a287d202e5aac63641d21d1602c5c
font_01_sfnt_off0000994c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x994C 18308 bytes
SHA-256: 8a34bf7029799339b91ee5bbc9e7150d15a201a0a283206b71f5bacd63347ffe

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