Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d1fcc5afd68366…

MALICIOUS

PDF

43.6 KB Created: 2021-05-14 12:29:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d4da16a1ebebcec609543192eda2d3f4 SHA-1: a844694263da6d782d1defd3e65a49b4caab4107 SHA-256: f6d1fcc5afd68366dfaa8ff2bb65386af59e297f05b4d7adb8e8fe6365265841
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt, a common lure to trick users into executing malicious content. It contains an embedded URL pointing to a resource that likely serves as a download or further redirection. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the ability to determine the exact execution flow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/get-free-robux-without-doing-anything-game-hack
    • http://somvisio.es/images/synapse-roblox-free_GM431946152.pdf
    • http://somvisio.es/images/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdf
    • http://somvisio.es/images/omplete-surveys-for-coin-master-free-spins_GM406889139.pdf
    • http://somvisio.es/images/make-robux_GM431946152.pdf
    • http://somvisio.es/images/bloxpage-free-robux_GM431946152.pdf
    • http://somvisio.es/images/coin-master-hack-apk-ios-download_GM406889139.pdf
    • http://somvisio.es/images/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdf
    • http://somvisio.es/images/roblox-admin-hack_GM431946152.pdf
    • http://somvisio.es/images/minecraft-free-school_GM479516143.pdf
    • http://somvisio.es/images/how-to-get-1-million-robux-for-free-2021_GM431946152.pdf
    • http://somvisio.es/images/minecraft-pe-texture-packs-free-download_GM479516143.pdf
    • http://somvisio.es/images/coin-master-332-apk-free-download_GM406889139.pdf
    • http://somvisio.es/images/wurst-client-18-9_GM479516143.pdf
    • http://somvisio.es/images/roblox-t-shirt-free_GM431946152.pdf
    • http://somvisio.es/images/coin-master-hack-without-verification-2021_GM406889139.pdf
    • http://somvisio.es/images/free-account-roblox-with-robux_GM431946152.pdf
    • http://somvisio.es/images/info-roblox-com-robux_GM431946152.pdf
    • http://somvisio.es/images/minecraft-noob-vs-pro-vs-hacker_GM479516143.pdf
    • http://somvisio.es/images/coin-master-free-spins-2021-generator_GM406889139.pdf
    • http://somvisio.es/images/twitter-coin-master-free-spins-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000493c.bin
77cfdd15a28b83eec60232d4c06caa147d4bcfe6aa7a14907b708db14af21640		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x493C 26084 bytes
font_01_sfnt_off00008567.bin
a9e3aa10522a438dd9eef37bb3e7f322f16e38379d063b4a50e22a05dda2bc13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8567 19240 bytes

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