Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b03ffd8ec39c81…

MALICIOUS

PDF

47.7 KB Created: 2021-06-11 12:04:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: da6b9b08bfada1d5b902e7f234b710dc SHA-1: 6c6303a546c4a42fae5b242ff01530d1cbad5201 SHA-256: 78b03ffd8ec39c81061f582f3b674538228baa2ebe7a73ee5778eb49d57d71e3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links and a document body referencing 'how to hack Roblox accounts' and 'free Robux', indicating a lure for users seeking in-game advantages. The PDF_SEO_LINK_FARM heuristic confirms a large number of external links, many pointing to similar scam-related PDFs, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/how-to-hack-roblox-accounts-2021-easy-game-hack
    • http://library.stembi.ac.id/repository/how-to-make-free-robux_GM431946152.pdf
    • http://library.stembi.ac.id/repository/free-spins-coin-master-app_GM406889139.pdf
    • http://library.stembi.ac.id/repository/free-robux-legit_GM431946152.pdf
    • http://library.stembi.ac.id/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdf
    • http://library.stembi.ac.id/repository/free-robux-without-verification_GM431946152.pdf
    • http://library.stembi.ac.id/repository/fortnite-skins-free-for-roblox_GM431946152.pdf
    • http://library.stembi.ac.id/repository/free-robux-pastebin-no-wait_GM431946152.pdf
    • http://library.stembi.ac.id/repository/minecraft-games-free-to-play-online_GM479516143.pdf
    • http://library.stembi.ac.id/repository/arsenal-roblox-hacker-report_GM431946152.pdf
    • http://library.stembi.ac.id/repository/android-hack-para-tener-robux-en-roblox_GM431946152.pdf
    • http://library.stembi.ac.id/repository/free-robux-so-sick-free_GM431946152.pdf
    • http://library.stembi.ac.id/repository/how-to-hack-the-streets-roblox_GM431946152.pdf
    • http://library.stembi.ac.id/repository/how-to-get-a-free-dominus-in-roblox-2021_GM431946152.pdf
    • http://library.stembi.ac.id/repository/hack-robux_GM431946152.pdf
    • http://library.stembi.ac.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • http://library.stembi.ac.id/repository/robux-hack-2021_GM431946152.pdf
    • http://library.stembi.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • http://library.stembi.ac.id/repository/haktuts-coin-master-free-spin-link_GM406889139.pdf
    • http://library.stembi.ac.id/repository/minecraft-pe-hack-client_GM479516143.pdf
    • http://library.stembi.ac.id/repository/roblox-studio-free-download-pc_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052d4.bin
ec6b86f7cb40a54006f529ae16dfe1a4ae3e51fe6bedd3a477ec3669c019f1ce		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D4 29428 bytes
font_01_sfnt_off00009515.bin
0a4c192dd0d49b475d670e2028b2e3d9bc88486e58824ff416e2d46c0acce708		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9515 19172 bytes

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