Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0891f37e68cac0…

MALICIOUS

PDF

44.1 KB Created: 2021-06-07 12:31:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 88ef7b36a1736868466b52d913b72c9f SHA-1: 0c6b11aa04f4c9ee3aac07cf341fb7c51d6b1aea SHA-256: 9f0891f37e68cac0d9db4d457fb7792d252e25bb433ecf1710e915a10609d769
102 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a call-to-action to trick the user into clicking a link, likely to download a second-stage payload. The embedded URL and numerous other URLs found in the document point to sites offering game-related cheats and hacks, suggesting a lure for users seeking such content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/how-to-be-a-pro-roblox-and-get-free-robux-game-hack PDF link annotation
    • http://manfeld.dk/images/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://manfeld.dk/images/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://manfeld.dk/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://manfeld.dk/images/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • http://manfeld.dk/images/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • http://manfeld.dk/images/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://manfeld.dk/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://manfeld.dk/images/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://manfeld.dk/images/lua-roblox-hack_GM431946152.pdfIn PDF document text
    • http://manfeld.dk/images/give-free-robux_GM431946152.pdfIn PDF document text
    • http://manfeld.dk/images/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://manfeld.dk/images/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://manfeld.dk/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://manfeld.dk/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://manfeld.dk/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://manfeld.dk/images/coin-master-hack-injection_GM406889139.pdfIn PDF document text
    • http://manfeld.dk/images/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • http://manfeld.dk/images/pokemon-go-free-things_GM1094591345.pdfIn PDF document text
    • http://manfeld.dk/images/coin-master-game-hunter_GM406889139.pdfIn PDF document text
    • http://manfeld.dk/images/how-to-get-free-robux-app_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
font_00_sfnt_off00004f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F42 24988 bytes
SHA-256: 753f572d1f6ea173e47f3e6bca97e23b97ba75e3fc9d7cbfeddd49d59f29f083
font_01_sfnt_off0000886e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x886E 18684 bytes
SHA-256: f01b98494e2259d1208dcc2085994a712db8dbc3f543cdf64ed5415f03fa4387

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