Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cdb616e2082763…

MALICIOUS

PDF

46.2 KB Created: 2021-05-16 15:26:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6a3eda85a04627e8c341937d6f5019a9 SHA-1: 562ac16bba1fa6df396d4f9d19260bc5212ec7e1 SHA-256: 16cdb616e20827636e8451e14543f3b170a8ceeefb95e5b5abc6c732ee2833a7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm designed to lure users with promises of game hacks. The ML classifier also flagged this PDF as malicious. The primary IOC is the initial URL which likely serves as a gateway to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/roblox-a-game-hack
    • http://www.marambio.com.ar/images/roblox-hack-scripts-pastebin_GM431946152.pdf
    • http://www.marambio.com.ar/images/free-roblox-clothes-for-your-avatar_GM431946152.pdf
    • http://www.marambio.com.ar/images/minecraft-xbox-360-free-download-code_GM479516143.pdf
    • http://www.marambio.com.ar/images/how-to-get-free-pet-food-in-coin-master_GM406889139.pdf
    • http://www.marambio.com.ar/images/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdf
    • http://www.marambio.com.ar/images/coin-master-free-100-spin-link_GM406889139.pdf
    • http://www.marambio.com.ar/images/free-fire-coin-master_GM406889139.pdf
    • http://www.marambio.com.ar/images/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • http://www.marambio.com.ar/images/minecraft-hacked-client-download_GM479516143.pdf
    • http://www.marambio.com.ar/images/free-redeem-code-for-coin-master_GM406889139.pdf
    • http://www.marambio.com.ar/images/www-bandicam-com-free-robux_GM431946152.pdf
    • http://www.marambio.com.ar/images/robuxmatchcon_GM431946152.pdf
    • http://www.marambio.com.ar/images/easypoints-gg-roblox_GM431946152.pdf
    • http://www.marambio.com.ar/images/coin-master-game-hack-apk_GM406889139.pdf
    • http://www.marambio.com.ar/images/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdf
    • http://www.marambio.com.ar/images/pig-master-free-spins-and-coins_GM406889139.pdf
    • http://www.marambio.com.ar/images/coin-master-mod-version-free-download-2021_GM406889139.pdf
    • http://www.marambio.com.ar/images/http-blackgamesus-coinmasterhack_GM406889139.pdf
    • http://www.marambio.com.ar/images/free-unlimited-robux_GM431946152.pdf
    • http://www.marambio.com.ar/images/free-coin-master-spins-blogger_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cac.bin
b36cab58b08211384d9c4df83232cabe3504492e4cb6899053c963321254167c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CAC 25952 bytes
font_01_sfnt_off0000899d.bin
e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f
pdf-font-stream PDF embedded font (sfnt) at offset 0x899D 2852 bytes
font_02_sfnt_off0000935f.bin
ecac86e2ebbcb5197ee90d5209091950a23223a632d77054b4fa777aef52a58d
pdf-font-stream PDF embedded font (sfnt) at offset 0x935F 17784 bytes