Malicious PDF — malware analysis report

Static analysis result for SHA-256 4861d02d232ce20a…

MALICIOUS

PDF

33.1 KB Created: 2021-07-21 05:04:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1c386a98a5d2e3be739298f320d29367 SHA-1: c96db692bb7ef94f33fa64b83144d566c8d99e3e SHA-256: 4861d02d232ce20ad668dca4958e2c29f0f6d693da7b36cad5ef1db9ff33c4a9
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 interacting with it. It contains multiple embedded URLs, including one pointing to 'netcdn.tw/app/479516143/free-minecraft-worlds-game-hack', which is likely a lure for a malicious download or exploit. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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 http://netcdn.tw/app/479516143/free-minecraft-worlds-game-hack PDF link annotation
    • http://akademiatenisa.org/images/free-tiktok-followers-no-verification-or-survey_GM835599320.pdfIn PDF document text
    • http://akademiatenisa.org/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://akademiatenisa.org/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://akademiatenisa.org/images/free-robux-come_GM431946152.pdfIn PDF document text
    • http://akademiatenisa.org/images/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • http://akademiatenisa.org/images/hack-robux_GM431946152.pdfIn PDF document text
    • http://akademiatenisa.org/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://akademiatenisa.org/images/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://akademiatenisa.org/images/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://akademiatenisa.org/images/how-to-get-free-robux-on-ipad_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
font_00_sfnt_off00002cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CBE 22832 bytes
SHA-256: 4cd030298b2b26c719c9cd79338723dcc2f871e6d9f0efae7aff1f7923b3c838
font_01_sfnt_off00005ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFA 18156 bytes
SHA-256: 664c7195a075aff6dcec565529a8f8eee0b73719923e2c76767f815b88d63ca4

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