Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9734c7ff7a6c279…

MALICIOUS

PDF

33.8 KB Created: 2021-06-29 20:09:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b94e7928625da21b87f9aa1b8c8b9a0c SHA-1: d34e16deb9e8293ca78a82ef5561d96bb33ab6d2 SHA-256: f9734c7ff7a6c279cc99b1c4bb73dfb1829e16e160b78d69b6ce32376f148762
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which are structured as SEO-optimized URLs, suggesting a link farm designed to attract users searching for free game items or accounts. The ML classifier strongly indicated maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document. The primary goal appears to be directing users to external sites that likely host further malicious content or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-ebay-roblox-accounts-game-hack
    • http://razredna-nastava.net/files/free-roblox-clothes-2021_GM431946152.pdf
    • https://razredna-nastava.net/files/is-minecraft-education-edition-free_GM479516143.pdf
    • http://razredna-nastava.net/files/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • https://razredna-nastava.net/files/avatar-the-last-airbender-roblox_GM431946152.pdf
    • https://razredna-nastava.net/files/get-free-robux-generator_GM431946152.pdf
    • https://razredna-nastava.net/files/roblox-play-as-geust-for-free_GM431946152.pdf
    • http://razredna-nastava.net/files/how-to-get-minecraft-java-free_GM479516143.pdf
    • http://razredna-nastava.net/files/minecraft-windows-10-free-code_GM479516143.pdf
    • https://razredna-nastava.net/files/minecraft-apk-download-free-11-055_GM479516143.pdf
    • http://razredna-nastava.net/files/coin-master-free-spin-bonus_GM406889139.pdf
    • http://razredna-nastava.net/files/free-daily-spins-coin-master-2021_GM406889139.pdf
    • https://razredna-nastava.net/files/minecraft-free-download-apk-softonic_GM479516143.pdf
    • http://razredna-nastava.net/files/how-to-get-clothes-for-free-roblox_GM431946152.pdf
    • https://razredna-nastava.net/files/free-roblox-accounts-phantom-forces-account_GM431946152.pdf
    • http://razredna-nastava.net/files/freespinandcoin-blogspot_GM406889139.pdf
    • http://razredna-nastava.net/files/legit-free-spins-coin-master_GM406889139.pdf
    • https://razredna-nastava.net/files/roblox-cheat-glitch-jailbreak_GM431946152.pdf
    • http://razredna-nastava.net/files/how-do-i-get-minecraft-for-free_GM479516143.pdf
    • https://razredna-nastava.net/files/coin-master-free-spins-hack-apk-download_GM406889139.pdf
    • http://razredna-nastava.net/files/how-to-download-minecraft-for-free-on-android_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e19.bin
bd3d900379228a97cafcfcce5d1f4ed9a285aba73c93863760e5ab0ec1148e74
pdf-font-stream PDF embedded font (sfnt) at offset 0x2E19 22076 bytes
font_01_sfnt_off00005ecc.bin
c64cb6896944a77700c067f8e497780c0ba8a403218fcdc305225b3ca4f45ec0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECC 19072 bytes