Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1f1f2c7a2059a5…

MALICIOUS

PDF

42.5 KB Created: 2021-05-19 20:05:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e38c73251c105cd3986dff82366713a8 SHA-1: 65786df759a8580721973a0fd2a3fe114757b4ab SHA-256: ed1f1f2c7a2059a58961f29c331cff9e5be24a37da461e3cb184171ed7a87c57
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that displays a fake CAPTCHA to lure users into clicking malicious links. The document body contains multiple URLs, including one pointing to 'netcdn.xyz', which is likely intended to download a second-stage payload. The ML classifier strongly flagged this PDF as malicious, supporting the observed fake CAPTCHA lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/coin-master-free-coins-link-blogspot-game-hack
    • http://schmittmusic.de/images/getrobux-ninja_GM431946152.pdf
    • http://schmittmusic.de/images/how-to-get-free-robux-on-phone-2021_GM431946152.pdf
    • http://schmittmusic.de/images/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://schmittmusic.de/images/ways-to-get-free-robux_GM431946152.pdf
    • http://schmittmusic.de/images/daily-free-spins-coin-master-2021_GM406889139.pdf
    • http://schmittmusic.de/images/free-robux-real-2021_GM431946152.pdf
    • http://schmittmusic.de/images/roblox-free-hair-boy_GM431946152.pdf
    • http://schmittmusic.de/images/free-roblox-accounts-2021-with-robux_GM431946152.pdf
    • http://schmittmusic.de/images/spin-link-coin-master_GM406889139.pdf
    • http://schmittmusic.de/images/is-it-possible-to-get-free-robux_GM431946152.pdf
    • http://schmittmusic.de/images/roblox-hack-ios_GM431946152.pdf
    • http://schmittmusic.de/images/free-spins-coin-master-links-blogspot_GM406889139.pdf
    • http://schmittmusic.de/images/arsenal-hacks-roblox_GM431946152.pdf
    • http://schmittmusic.de/images/free-roblox-hack-us_GM431946152.pdf
    • http://schmittmusic.de/images/free-minecraft-packs_GM479516143.pdf
    • http://schmittmusic.de/images/roblox-exploit-download_GM431946152.pdf
    • http://schmittmusic.de/images/coin-master-link_GM406889139.pdf
    • http://schmittmusic.de/images/free-robux-giveaway-live_GM431946152.pdf
    • http://schmittmusic.de/images/coin-master-free-daily-spins-link_GM406889139.pdf
    • http://schmittmusic.de/images/20210-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ac7.bin
81c064bc1cf002e300db92845d9aab8d0b78854337b8a7aff81b935a71a0905f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC7 24408 bytes
font_01_sfnt_off000082c2.bin
25a48d095538c21b3574d128913f1d88808f27fbb4560e17bb648f934a14342e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C2 18632 bytes

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