Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9c3c9d9d41bd50…

MALICIOUS

PDF

49.3 KB Created: 2021-06-11 08:17:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 113419a7bde68597cba9be827b272812 SHA-1: 1b408ce10f0b8f4e9e18d1a918512913e3deb3a9 SHA-256: bf9c3c9d9d41bd505ddb013eca9455bcb63de654ee7244c33aeed567126e605d
142 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are presented as a fake CAPTCHA or human verification prompt to trick users into clicking them. The links lead to websites offering game hacks and cheats, suggesting a lure for potentially malicious content or further exploitation. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/roblox-polyguns-hack-game-hack
    • https://pustaka.mic.sch.id//repository/robuxlove-net-free-robux_GM431946152.pdf
    • https://pustaka.mic.sch.id//repository/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdf
    • https://pustaka.mic.sch.id//repository/free-robux-websites-that-actually-work_GM431946152.pdf
    • https://pustaka.mic.sch.id//repository/robux-hack-no-verification_GM431946152.pdf
    • https://pustaka.mic.sch.id//repository/minecraft-hacks-wurst_GM479516143.pdf
    • https://pustaka.mic.sch.id//repository/free-robux-no-verification-2021-android_GM431946152.pdf
    • https://pustaka.mic.sch.id//repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • https://pustaka.mic.sch.id/repository/free-roblox-accounts-with-robux-september-2021_GM431946152.pdf
    • https://pustaka.mic.sch.id//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdf
    • https://pustaka.mic.sch.id/repository/free-roblox-account-rich-ro-ghoul_GM431946152.pdf
    • https://pustaka.mic.sch.id//repository/coin-master-apk-hack-download_GM406889139.pdf
    • https://pustaka.mic.sch.id//repository/robux-generators-that-actually-work_GM431946152.pdf
    • https://pustaka.mic.sch.id//repository/blox-supply-free-robux_GM431946152.pdf
    • https://pustaka.mic.sch.id//repository/minecraft-free-minecraft_GM479516143.pdf
    • https://pustaka.mic.sch.id//repository/roblox-promo-code-to-get-free-robux_GM431946152.pdf
    • https://pustaka.mic.sch.id//repository/how-to-get-free-robux-generator_GM431946152.pdf
    • https://pustaka.mic.sch.id//repository/haktuts-2021-coin-master-free-spin-link_GM406889139.pdf
    • https://pustaka.mic.sch.id//repository/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • https://pustaka.mic.sch.id//repository/www-free-robux-com_GM431946152.pdf
    • https://pustaka.mic.sch.id//repository/claim-free-robux-button_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000515c.bin
318569b983b9e54d1ac3f318037ca4a70fd0b1f9cbde4771b7c16a593ce58ac5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x515C 31608 bytes
font_01_sfnt_off00009c51.bin
9558e7c18c5f91d4750237b1d0d9e6b00f29db6b6c1692561d344ad8a6090124		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C51 18944 bytes

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