Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99b70f36a106ee3…

MALICIOUS

PDF

41.7 KB Created: 2021-05-13 14:32:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c278dc30e13e4fd6052ffd11489177a0 SHA-1: 06d3c1451a8a91c1bd4e786f2069b986096fedda SHA-256: d99b70f36a106ee3722411964b5baf1626f5432f1197d9e6793e671c12c1ff2f
82 Risk Score

Malware Insights

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

The PDF document presents a fake CAPTCHA to trick the user into clicking a link, which is a common social engineering tactic. The embedded link points to a URL that likely hosts a malicious payload. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/free-robux-pin-codes-game-hack
    • http://classicskitours.net/images/coin-master-hack-2021-free_GM406889139.pdf
    • http://classicskitours.net/images/best-free-minecraft-server-hosting-reddit_GM479516143.pdf
    • http://classicskitours.net/images/free-roebucks-com_GM431946152.pdf
    • http://classicskitours.net/images/omplete-surveys-for-coin-master-free-spins_GM406889139.pdf
    • http://classicskitours.net/images/minecraft-java-edition-code-free_GM479516143.pdf
    • http://classicskitours.net/images/google-how-do-you-get-free-robux_GM431946152.pdf
    • http://classicskitours.net/images/master-free-spin-and-coin-link_GM406889139.pdf
    • http://classicskitours.net/images/how-to-hack-robux_GM431946152.pdf
    • http://classicskitours.net/images/coin-master-hack-pc-cheat-engine_GM406889139.pdf
    • http://classicskitours.net/images/coin-master-free-coins-link-2021_GM406889139.pdf
    • http://classicskitours.net/images/free-robux-glitch_GM431946152.pdf
    • http://classicskitours.net/images/is-free-robux-real_GM431946152.pdf
    • http://classicskitours.net/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdf
    • http://classicskitours.net/images/real-free-robux-codes_GM431946152.pdf
    • http://classicskitours.net/images/minecraft-dungeons-free-download-pc_GM479516143.pdf
    • http://classicskitours.net/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdf
    • http://classicskitours.net/images/coin-master-spins-2021_GM406889139.pdf
    • http://classicskitours.net/images/what-is-exploiting-in-roblox_GM431946152.pdf
    • http://classicskitours.net/images/roblox-report-hacker_GM431946152.pdf
    • http://classicskitours.net/images/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdf
    • https://www.roblox.co
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047a0.bin
94536ddc85dc27bf7044258b43f8eb0005511f5a15b3fe73e97599c3936dc448		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47A0 24764 bytes
font_01_sfnt_off0000803d.bin
23872266a6577b01853888d52c04c526ac323517b7f86f8cb64f3b9e81653507		 pdf-font-stream PDF embedded font (sfnt) at offset 0x803D 18464 bytes

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