Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac4819440da1041…

MALICIOUS

PDF

34.6 KB Created: 2021-07-02 06:05:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d3235fd243c6bcbf128d85f55dd8134e SHA-1: 6a0c281ff741842a64cadfbda6751933e5a8d3b2 SHA-256: 9ac4819440da10416566a53aa1452048c5c23066ba482eda178e3f7930a8b12f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a document body that promotes free in-game currency and hacks for popular games. The presence of a large number of external links, many pointing to PDF files with game-related slugs, suggests a link farm or a distribution point for malicious files. The ML classifier also strongly indicated maliciousness.

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/ok-google-how-do-you-get-free-robux-game-hack
    • https://silvterie.com.br/images/ckfinder/files/coin-master-free-cards-link_GM406889139.pdf
    • https://silvterie.com.br/images/ckfinder/files/watch-videos-and-complete-offers-to-earn-free-robux_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/free-coins-spins-on-coin-master_GM406889139.pdf
    • https://silvterie.com.br/images/ckfinder/files/mine-minecraft-games-for-free_GM479516143.pdf
    • https://silvterie.com.br/images/ckfinder/files/wurst-115-2_GM479516143.pdf
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-robux-on-chromebook_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/coin-master-hack-mod-apk_GM406889139.pdf
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-robux-youtube_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/does-free-giveaway-game-actually-gives-you-robux_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/coin-master-hack-ios-no-verification_GM406889139.pdf
    • https://silvterie.com.br/images/ckfinder/files/hack-sex-roblox_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/buy-robux-free_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/minecraft-diamond-finder-hack_GM479516143.pdf
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/get-free-robux-now_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/free-roblox-accounts-phantom-forces-account_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/card-hack-for-coin-master_GM406889139.pdf
    • https://silvterie.com.br/images/ckfinder/files/best-hack-guis-roblox_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/roblox-lab-experiment-hack-script_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-minecraft-realms-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031f0.bin
af1b6a8470a314f58e88b18f45ce4cf2da5181aaa8acf5ec262b377bb771588d
pdf-font-stream PDF embedded font (sfnt) at offset 0x31F0 21356 bytes
font_01_sfnt_off00006083.bin
e4914d65789a197e954c6a36dfac9113f41bf4479b0c9c218b4dc30aeb9f845d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6083 19560 bytes