Malicious PDF — malware analysis report

Static analysis result for SHA-256 04bbb07d5dcfea85…

MALICIOUS

PDF

45.4 KB Created: 2021-06-06 23:58:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 54f4bca80273065b89d55f27d2cc849d SHA-1: 30e9c780dbc41ff68ee73e1feba1ca3617b54782 SHA-256: 04bbb07d5dcfea85d6d6fe066bea015f46162fde1508d6d645c41c15c9ef4bfb
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with the document. It also embeds multiple URLs that likely lead to malicious content or further stages of an attack. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of harmful intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/robux-hack-inspect-element-game-hack PDF link annotation
    • http://iprep-u.com/images/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://iprep-u.com/images/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://iprep-u.com/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://iprep-u.com/images/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://iprep-u.com/images/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://iprep-u.com/images/coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://iprep-u.com/images/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://iprep-u.com/images/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://iprep-u.com/images/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://iprep-u.com/images/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://iprep-u.com/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://iprep-u.com/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://iprep-u.com/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://iprep-u.com/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://iprep-u.com/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://iprep-u.com/images/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • http://iprep-u.com/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://iprep-u.com/images/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://iprep-u.com/images/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://iprep-u.com/images/minecraft-hacked-client_GM479516143.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_off00004f0f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F0F 26556 bytes
SHA-256: 5a2467a5666e00e3820190ef2235109959834e0e9130db9e82c1aa02c3b9a327
font_01_sfnt_off00008d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D3C 18864 bytes
SHA-256: ba12c910520c74aee5ee2efaf168d7a873e28b5990483bf2b11cc9a759ee55c3

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