Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd3b4d78d83f38d…

MALICIOUS

PDF

47.8 KB Created: 2021-05-12 10:41:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b958668ff88d54e2cfe494e3e91ec6a6 SHA-1: a64e50eaa1d2b08ebaee872ebfa94b5b7f1a7b8a SHA-256: 5bd3b4d78d83f38d1b1c26560f7023a6aad0e924715654d3acca4e846f30596b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm designed to drive traffic. The document body and extracted URLs indicate a lure for free game-related items like Robux and Minecraft, likely to trick users into downloading malware. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 4

  • 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.
  • 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-meme-game-hack
    • http://wiesbadener-marktplatz.de/images/best-way-to-get-free-robux_GM431946152.pdf
    • http://wiesbadener-marktplatz.de/images/how-to-buy-robux-for-free_GM431946152.pdf
    • http://wiesbadener-marktplatz.de/images/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdf
    • http://wiesbadener-marktplatz.de/images/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdf
    • http://wiesbadener-marktplatz.de/images/free-robux-microsoft_GM431946152.pdf
    • http://wiesbadener-marktplatz.de/images/coin-master-free-spins-coins_GM406889139.pdf
    • http://wiesbadener-marktplatz.de/images/what-is-a-minecraft-client_GM479516143.pdf
    • http://wiesbadener-marktplatz.de/images/free-mods-for-minecraft-pe_GM479516143.pdf
    • http://wiesbadener-marktplatz.de/images/how-to-download-minecraft-for-free_GM479516143.pdf
    • http://wiesbadener-marktplatz.de/images/is-minecraft-java-edition-free_GM479516143.pdf
    • http://wiesbadener-marktplatz.de/images/coin-master-daily-bonus_GM406889139.pdf
    • http://wiesbadener-marktplatz.de/images/daily-spin-coin-master-free_GM406889139.pdf
    • http://wiesbadener-marktplatz.de/images/free-robux-no-apps_GM431946152.pdf
    • http://wiesbadener-marktplatz.de/images/free-robux-com-roblox_GM431946152.pdf
    • http://wiesbadener-marktplatz.de/images/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • http://wiesbadener-marktplatz.de/images/mcpe-master-coins-hack_GM406889139.pdf
    • http://wiesbadener-marktplatz.de/images/coin-master-hack-tool-access-online-generator_GM406889139.pdf
    • http://wiesbadener-marktplatz.de/images/coin-master-free-spins-link-2021-twitter_GM406889139.pdf
    • http://wiesbadener-marktplatz.de/images/offers-for-robux_GM431946152.pdf
    • http://wiesbadener-marktplatz.de/images/roblox-hacks-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b24.bin
13b71bd6ac72637f21a1acf121ee59f5ba7bb4f321752d40ea4f523a307b95f9
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B24 27944 bytes
font_01_sfnt_off00008ae8.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE8 5696 bytes
font_02_sfnt_off000097fa.bin
3e6db3c9d7b90636a2057efa50536683edf8623f57b31e837fe721178fdf9957
pdf-font-stream PDF embedded font (sfnt) at offset 0x97FA 18468 bytes