Malicious PDF — malware analysis report

Static analysis result for SHA-256 e247570adeb45876…

MALICIOUS

PDF

31.6 KB Created: 2021-07-19 01:40:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cef078119a645cd99fc5e816b3d5028e SHA-1: 2c8f3bb27bd4b7b7432beec9cfc5a4f4b75d69ad SHA-256: e247570adeb45876db16e475e7ff68ecde5863d5182d529b2f239909007fd768
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 to trick the user into interacting with a malicious link. This link, http://netcdn.tw/app/479516143/free-minecraft-texture-packs-game-hack, likely serves as a downloader for a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9582

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-texture-packs-game-hack
    • https://uniman.ch/images/promo-codes-for-free-robux_GM431946152.pdf
    • https://uniman.ch/images/minecraft-hacks-115-2_GM479516143.pdf
    • https://uniman.ch/images/coin-master-free-blogspot_GM406889139.pdf
    • http://uniman.ch/images/minecraft-download-free-download_GM479516143.pdf
    • https://uniman.ch/images/free-100-robux_GM431946152.pdf
    • https://uniman.ch/images/download-minecraft-free-hiapphere_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ac3.bin
98d7d5a1ebb75e6b72b0be4c20b37f35e81b9b413678a8559c976ebf756f40fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2AC3 21696 bytes
font_01_sfnt_off00005a11.bin
f1e7a9ae3acfaa3d56f6a9afcdcc307065316a5e3d8814942fd3993c062bfaf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A11 18240 bytes

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