Malicious PDF — malware analysis report

Static analysis result for SHA-256 75837a30f543a6bf…

MALICIOUS

PDF

32.4 KB Created: 2021-07-19 15:05:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 273f365b6358835b18614fea62a0bd29 SHA-1: 525c6325d40c3f1cb259f5ff8902c567b5cc2f91 SHA-256: 75837a30f543a6bf9a29e6cd62a6e9681025cd4998c6abc757b6afe6d0eb49b9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document presents a fake CAPTCHA and a "Click Here to Access" button, which are common lures for tricking users into downloading malicious files. The embedded URLs, such as http://netcdn.tw/app/479516143/minecraft-bedrock-edition-free-game-hack, likely host the actual malware payload. No scripts were extracted, but the PDF structure and heuristics strongly indicate a malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 5

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/minecraft-bedrock-edition-free-game-hack
    • https://magistrinfo.ru/images/minecraft-java-edition-free-trial_GM479516143.pdf
    • https://magistrinfo.ru/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdf
    • https://magistrinfo.ru/images/free-robux-kid-friendly-no-human-verification_GM431946152.pdf
    • https://magistrinfo.ru/images/free-tiktok-bots_GM835599320.pdf
    • http://magistrinfo.ru/images/how-to-get-robux-for-free-2021_GM431946152.pdf
    • https://magistrinfo.ru/images/minecraft-for-chromebook-free_GM479516143.pdf
    • https://magistrinfo.ru/images/get-free-robux-no-human-verification_GM431946152.pdf
    • https://magistrinfo.ru/images/free-tiktok-followers-app_GM835599320.pdf
    • https://magistrinfo.ru/images/hacks-to-get-free-robux_GM431946152.pdf
    • https://magistrinfo.ru/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000298b.bin
89bb6b4175305aa36f3e220f858997e07b6150cb65566595c2be53256f936c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x298B 22868 bytes
font_01_sfnt_off00005cbd.bin
0b29718dce26c4d1fb8eff562362f22d55d4276ac23c5c88aa1b07f7376859fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBD 18268 bytes

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