Malicious PDF — malware analysis report

Static analysis result for SHA-256 596484bdf4a20f6a…

MALICIOUS

PDF

44.3 KB Created: 2021-06-09 17:04:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 48785ee12737eb2d8bcfeeb23bb624a2 SHA-1: da8a7f8a4b0ec54e5fe1e0b0f51b611b76e65307 SHA-256: 596484bdf4a20f6a66aea9a54576b094b3a965d70d4fc2486ee95affe29b3827
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA lure to entice users into clicking embedded malicious links, such as the one pointing to 'https://netcdn.tw/app/431946152/real-robux-hack-no-survey-2021-febuary-game-hack'. This behavior is indicative of a phishing or scam attempt, likely designed to lead to further malicious content or exploit kits. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/real-robux-hack-no-survey-2021-febuary-game-hack PDF link annotation
    • http://www.library.gkigadingserpong.org/repository/minecraft-free-download-mobile_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/dbor-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/dragon-ball-z-final-stand-roblox-free-levels_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/is-there-any-free-ways-of-getting-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-game-nocopyslocked_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000511e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x511E 23828 bytes
SHA-256: dee5cc8bae76be63221a728436c50b4015ca16d2fd4dfdd2d134241b8aea791d
font_01_sfnt_off00008797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8797 19180 bytes
SHA-256: b37ac0a2a1ce80ff23598e468e46f3f689d121f981681d6a6051276a214edbb6

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