Malicious PDF — malware analysis report

Static analysis result for SHA-256 2103e7225808fe1a…

MALICIOUS

PDF

43.4 KB Created: 2021-05-19 22:17:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 53371845664aaad2c2422bb42252b898 SHA-1: dc87c93a0fa8e39163f262e74d189bb35acaeb4e SHA-256: 2103e7225808fe1aaceecd372245d7c85b0b53566b84f8006cd0a7bf6edba769
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm. The document body, though heavily obfuscated, contains text related to 'Robux' and a URL that appears to be a download lure. The presence of these links and the ML classifier's high confidence score suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-800-robux-game-hack
    • http://ce-tsv-nantes.fr/images/best-free-roblox-outfits_GM431946152.pdf
    • http://ce-tsv-nantes.fr/images/how-to-hack-coin-master-with-root_GM406889139.pdf
    • http://ce-tsv-nantes.fr/images/how-to-buy-robux-for-free_GM431946152.pdf
    • http://ce-tsv-nantes.fr/images/how-much-tiktok-free-followers_GM835599320.pdf
    • http://ce-tsv-nantes.fr/images/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdf
    • http://ce-tsv-nantes.fr/images/coin-master-fun-hack-online_GM406889139.pdf
    • http://ce-tsv-nantes.fr/images/coin-master-free-coins-and-spins-link-2021_GM406889139.pdf
    • http://ce-tsv-nantes.fr/images/coin-master-hack-fast_GM406889139.pdf
    • http://ce-tsv-nantes.fr/images/coin-master-blogspot-free-spins_GM406889139.pdf
    • http://ce-tsv-nantes.fr/images/coin-master-daily-free-spins-link-2021_GM406889139.pdf
    • http://ce-tsv-nantes.fr/images/is-coin-master-hacks-safe_GM406889139.pdf
    • http://ce-tsv-nantes.fr/images/how-to-generate-free-coin-master-spin_GM406889139.pdf
    • http://ce-tsv-nantes.fr/images/coin-master-free-spins-haktuts_GM406889139.pdf
    • http://ce-tsv-nantes.fr/images/coin-master-hack-tool-v1-9-download_GM406889139.pdf
    • http://ce-tsv-nantes.fr/images/roblox-hack-game_GM431946152.pdf
    • http://ce-tsv-nantes.fr/images/free-coins-coin-master-today_GM406889139.pdf
    • http://ce-tsv-nantes.fr/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdf
    • http://ce-tsv-nantes.fr/images/play-roblox-for-free-on-google_GM431946152.pdf
    • http://ce-tsv-nantes.fr/images/roblox-free-robux-no-verification_GM431946152.pdf
    • http://ce-tsv-nantes.fr/images/free-robux-giveaway_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004887.bin
8637b354536ccc63723ac3c11aa9d1a50422ae9fa20a239b1b885fa876956995
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4887 28028 bytes
font_01_sfnt_off0000870c.bin
2059a7894931e9b75336f5975f03d939213f3fdb926ff7d6db67df9fd1731cb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x870C 18396 bytes