Malicious PDF — malware analysis report

Static analysis result for SHA-256 5820d6f77a82d947…

MALICIOUS

PDF

43.3 KB Created: 2021-05-12 11:36:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5f6d34e40de181045f8fd63e766b659f SHA-1: 48f973b9e46b8b2e9b26bdbb8f26c5805a431949 SHA-256: 5820d6f77a82d9471a23a604c4986fbdaa7478c656a953502636463c6ce53d2a
82 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/robloxhero.xyz-free-robux-game-hack PDF link annotation
    • http://opac.kolejkrim.edu.my/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-free-online-unblocked_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-spins-for-today_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_003_off00004918.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4918 26224 bytes
SHA-256: 2d7a2719348b596ac9a64e3260a2184137944f0671c082893c961505e0b7cf1e
font_01_sfnt_off0000864b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x864B 18584 bytes
SHA-256: d96645d743d7bc7e16305d404e9ae036d13b2ec1544ce4a3e073a2af54c3cd1e

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