Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c1d1f1d2a7d781…

MALICIOUS

PDF

42.3 KB Created: 2021-05-21 00:18:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4852a2468578f2677c740108abc9ed9a SHA-1: 70a24aeb7b6dcbe04641268e2e0ad619696a25ea SHA-256: 16c1d1f1d2a7d78150f83021db6322b6638fb52379753298132c6ced21d38157
82 Risk Score

Malware Insights

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

The PDF document contains a lure for 'Free Robux' and presents a fake CAPTCHA, a common tactic to trick users into clicking malicious links. The embedded URLs point to external resources that likely host further malicious content or scams. The ML classifier also flagged this PDF as malicious, increasing confidence in its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7429

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/431946152/free-robux-without-verification-game-hack
    • http://behsanroshd.com/images/free-robux-earn_GM431946152.pdf
    • http://behsanroshd.com/images/coin-master-free-gift-cards_GM406889139.pdf
    • http://behsanroshd.com/images/lastrick-com-coin-master-hack_GM406889139.pdf
    • http://behsanroshd.com/images/free-games-like-minecraft_GM479516143.pdf
    • http://behsanroshd.com/images/do-you-get-minecraft-windows-10-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003486.bin
94750cbcd91ef77b439b9b37e7ab8490257d578d721a634590f9dd6a48f284bd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3486 30400 bytes
font_01_sfnt_off00007883.bin
d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7883 2820 bytes
font_02_sfnt_off0000821d.bin
5864977637737ef4e1bd5b7bfc66e5602b8aa3d3ed60f74fb5f96fd63c3aa8ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x821D 18964 bytes

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