Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6bada099f22b87…

MALICIOUS

PDF

42.6 KB Created: 2021-05-13 07:45:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f6e38d717d0bff2da9f46ece79ea531a SHA-1: 392468fb399daf2cefb24523c2e53f1e796d00ee SHA-256: 9c6bada099f22b87968fbd004f91b56a251576dae2bb00520414d61763935382
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which are SEO-optimized and point to sites offering game-related hacks and currency. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests a tactic to distribute malicious content or engage in SEO poisoning. The document body itself contains a primary URL related to 'free Robux', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/earn-free-robux-for-roblox-game-hack
    • http://feuerwehr-rheinau.de/images/is-minecraft-earth-free_GM479516143.pdf
    • http://feuerwehr-rheinau.de/images/best-site-for-free-coin-master-free-spin-link_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/minecraft-115-2-hacks_GM479516143.pdf
    • http://feuerwehr-rheinau.de/images/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdf
    • http://feuerwehr-rheinau.de/images/coin-master-free-spins-and-coins-generator_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/coin-master-free-spins-link-hack_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/robloxheroxyz-free-robux_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/rbx-land-free-robux_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/free-spins-coin-master-2021-no-verification_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/how-to-hack-roblox-accounts_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/free-spins-on-coin-master_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/free-coins-on-coin-master-2021_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/how-to-get-free-admin-in-roblox_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/coin-master-free-cards-link_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/earn-free-robux-on-roblox_GM431946152.pdf
    • http://feuerwehr-rheinau.de/images/spins-coin-master_GM406889139.pdf
    • http://feuerwehr-rheinau.de/images/is-there-a-free-version-of-minecraft_GM479516143.pdf
    • http://feuerwehr-rheinau.de/images/free-spins-coin-master-daily_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004869.bin
f516232a4f5f262aec25e2e22dcfed702f9ff0e8d52c0b1ed4b4c74678efa291
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4869 25652 bytes
font_01_sfnt_off000083fc.bin
81577c12f28394e63c3fe269139937f952c5f2f271c4ac7315843a65914bc4b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x83FC 18316 bytes