Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d8be0e9c145a79…

MALICIOUS

PDF

45.4 KB Created: 2021-06-09 01:52:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e31dd19a2f23d578d2dff3da582f9dbe SHA-1: 9b748aae018c2b7225009afc56046011adbfc62d SHA-256: d8d8be0e9c145a790be307c4b546fd226bc774ba6cec41bb1cac5d37f762f696
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into interacting with it. It contains multiple embedded URLs, including one pointing to a potential exploit or download site. The ML classifier also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/roblox-scratchy-youtube-how-to-get-free-games-game-hack PDF link annotation
    • http://berntfoto.dk/images/robux-robux_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/obby-for-free-robux-real_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://berntfoto.dk/images/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • http://berntfoto.dk/images/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-hack-without-verification_GM406889139.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_004_off00004ff2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FF2 25472 bytes
SHA-256: 8fbaf52e85c9b43f8f08a150236e6be8da76bb302122c5f7b7211f246803cde9
font_01_sfnt_off00008bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB9 19352 bytes
SHA-256: a351ca42dc80cc384d361e61a2bee43a44403abc49fd2af43bcf731ea19c137e

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