Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5340f3c06705e55…

MALICIOUS

PDF

42.4 KB Created: 2021-05-13 11:33:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 75e6f862b6b80c6b983d1944cf51c46f SHA-1: aa7330549d6c1d13e21c4ac665b2602cd496d2fe SHA-256: b5340f3c06705e554184f64f6848b4430e68c159b786349b93bba1e8a1595175
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and a large number of external links, indicating a phishing or scam attempt. The primary URL, https://netcdn.xyz/app/431946152/hack-robux-game-hack, is likely a landing page for a malicious download or exploit. The presence of numerous PDF links suggests a link farm designed to distribute further malicious content or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/hack-robux-game-hack
    • http://calavera.be/images/free-robux-com-roblox_GM431946152.pdf
    • http://calavera.be/images/roblox-login-hack_GM431946152.pdf
    • http://calavera.be/images/free-coin-master-spins-and-coins-for-daily_GM406889139.pdf
    • http://calavera.be/images/coin-master-heaven-free-spins-today_GM406889139.pdf
    • http://calavera.be/images/free-coins-on-coin-master-generator_GM406889139.pdf
    • http://calavera.be/images/daily-coin-master-free-link_GM406889139.pdf
    • http://calavera.be/images/best-free-spin-app-for-coin-master_GM406889139.pdf
    • http://calavera.be/images/coin-master-hack-to-get-free-spins_GM406889139.pdf
    • http://calavera.be/images/coin-master-free-spins-hack-download_GM406889139.pdf
    • http://calavera.be/images/minecraft-windows-10-code-free_GM479516143.pdf
    • http://calavera.be/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://calavera.be/images/coin-master-daily-free-spins_GM406889139.pdf
    • http://calavera.be/images/coin-master-free-download_GM406889139.pdf
    • http://calavera.be/images/coin-master-home_GM406889139.pdf
    • http://calavera.be/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdf
    • http://calavera.be/images/coin-master-hack-no-verification-no-signup_GM406889139.pdf
    • http://calavera.be/images/get-free-robux-info_GM431946152.pdf
    • http://calavera.be/images/coinmasterdailyfreespins-com_GM406889139.pdf
    • http://calavera.be/images/minecraft-realms-free-codes_GM479516143.pdf
    • http://calavera.be/images/codes-how-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004708.bin
998b682ce866dfb29ea61a2f1da40cc1394c2f75d6754e1eb9f8c1fbd2e68eda
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4708 26152 bytes
font_01_sfnt_off00008326.bin
9805bb7d0eadd4beaac6fd3b5d5d8b6e8e5d33c97ce909732e364f826719e5d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8326 18248 bytes