Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d54a6cd12a3973…

MALICIOUS

PDF

32.8 KB Created: 2021-07-20 09:41:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c7b360a1623442d61b61d8809afc57be SHA-1: 233cb91acfc7c12154ea027f218f51686a33dd97 SHA-256: f5d54a6cd12a39737f648c7ab37f0c754d525f6637586ce476fc5a415fb59d03
82 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The embedded URLs point to websites offering free game codes or hacks, further supporting the phishing or malware distribution pretext. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of harmful content.

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-codes-game-hack PDF link annotation
    • http://dobrovodie.ru/images/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • http://dobrovodie.ru/images/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://dobrovodie.ru/images/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://dobrovodie.ru/images/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://dobrovodie.ru/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://dobrovodie.ru/images/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://dobrovodie.ru/images/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://dobrovodie.ru/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://dobrovodie.ru/images/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://dobrovodie.ru/images/free-minecraft-bedrock_GM479516143.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_off00002d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D89 22432 bytes
SHA-256: 90c29b857f769818720b5a73e4c47f3853ff5cc07eef9cae13c877aa0cb34136
font_01_sfnt_off00005f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F60 17884 bytes
SHA-256: ca0982e5699fcbbad1c272e9f6df792bd17b0fef580afa6f1747d77cedc77eee

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