Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6617f72af0947b9…

MALICIOUS

PDF

40.6 KB Created: 2021-05-22 11:34:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 725a55900983c85c3c543189fff1e311 SHA-1: ad2c9e0b374a31155924786f159c16a48f8f35c7 SHA-256: a6617f72af0947b98852f111c35d8f1c08a99c51945e12d003ca6520e90a0313
82 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 download" lure, aiming to trick users into believing they can get free Robux. It contains multiple embedded URLs, with the primary one pointing to a suspicious domain likely serving a malicious payload. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7768

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-no-verification-or-survey-game-hack
    • https://elearning.ickendari.sch.id/__statics/gudangsoal/files/freerobuxhack-us-2021_GM431946152.pdf
    • https://elearning.ickendari.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master_GM406889139.pdf
    • https://elearning.ickendari.sch.id/__statics/gudangsoal/files/coin-master-spins_GM406889139.pdf
    • https://elearning.ickendari.sch.id/__statics/gudangsoal/files/coin-master-hack-activegamer_GM406889139.pdf
    • https://elearning.ickendari.sch.id/__statics/gudangsoal/files/free-coins-and-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003465.bin
73cc00a7a0588c71d4d4091fe475a4d481048968c324094191c56ba8357e9d1a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3465 27056 bytes
font_01_sfnt_off000070fa.bin
889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70FA 2984 bytes
font_02_sfnt_off00007b25.bin
85e8471d4bb7809b16494b43ecc998cec7f87bafeaec38a3001510264e72f0e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B25 18892 bytes

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