Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73f47710d06c319…

MALICIOUS

PDF

45.6 KB Created: 2021-06-03 07:43:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5867c65b248182f8981b57f83db68903 SHA-1: c884b20104c759601ed017d057e6ef23774b43d3 SHA-256: a73f47710d06c319e64565cecb8ecf9a8d2d0b50a8abb9863ba5c375dc4a739b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document displays a fake CAPTCHA or human verification prompt to trick users into clicking a link. The embedded URL, https://netcdn.online/app/431946152/free-robux-generator-2021-no-human-verification-or-survey-game-hack, likely leads to a malicious site for further exploitation. The ML classifier also flagged this PDF as malicious.

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.online/app/431946152/free-robux-generator-2021-no-human-verification-or-survey-game-hack PDF link annotation
    • http://www.biochemix.com/uploaded_files/userfiles/files/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-free-robux_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/moon-active-games_GM406889139.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/minecraft-free-download-laptop_GM479516143.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/wurst-mc_GM479516143.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-robux-link_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • http://www.biochemix.com/uploaded_files/userfiles/files/codes-to-get-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_004_off00005097.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5097 25472 bytes
SHA-256: 853f04f3b413ee18425bd9c96e11947714efab3ee754c6132f3ef763fd70b948
font_01_sfnt_off00008bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBC 19556 bytes
SHA-256: 76adbda1d3e57e3064df3e292cf485a94c26c1a96e5d3a4e3c484cd1a4e129d0

Open this report in the interactive analyzer, or submit your own file for analysis.