Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd566e2cfa42f770…

MALICIOUS

PDF

32.8 KB Created: 2021-07-07 19:08:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3d534dfc1b2302528dd37ad7cfb7c96f SHA-1: 13504eaebd23260fd98da609913eb373674f82e6 SHA-256: cd566e2cfa42f770544ccde98d2e32d80365aa582804de7fd15573c91c4f10c9
102 Risk Score

Malware Insights

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

This PDF document was generated by wkhtmltopdf and contains numerous links to external PDF files, many of which appear to be part of a link farm. The document body and extracted URLs suggest a lure for free in-game items or currency for popular games, likely intended to trick users into visiting malicious sites. The ML classifier strongly indicated maliciousness, and the presence of a large number of external links points towards a phishing or scamming attempt.

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.tw/app/479516143/minecraft-coins-free-game-hack
    • https://silvterie.com.br/images/ckfinder/files/free-minecraft-domain_GM479516143.pdf
    • https://silvterie.com.br/images/ckfinder/files/free-roblox-clothes-for-your-avatar_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/minecraft-java-edition-download-free_GM479516143.pdf
    • https://silvterie.com.br/images/ckfinder/files/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • https://silvterie.com.br/images/ckfinder/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/coin-master-hack-ios-apk_GM406889139.pdf
    • https://silvterie.com.br/images/ckfinder/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdf
    • https://silvterie.com.br/images/ckfinder/files/roblox-help-free-robux_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/free-roblox-account-email-and-password_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/gladiator-simulator-strength-hacks-roblox_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/free-robux-codes-no-verification_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/free-robux-no-verification-2021_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/www-free-robux_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/roblox-boost-free-robux_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/free-links-for-coin-master_GM406889139.pdf
    • https://silvterie.com.br/images/ckfinder/files/roblox-teleport-hack-download_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/roblox-hack-site_GM431946152.pdf
    • https://silvterie.com.br/images/ckfinder/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdf
    • https://silvterie.com.br/images/ckfinder/files/robuxmatchcom-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002eae.bin
9f509f1c1bf1837fbb8ac305e3bbcc8dfff89369bd38cdaf2d82f56ce5eb7feb
pdf-font-stream PDF embedded font (sfnt) at offset 0x2EAE 21948 bytes
font_01_sfnt_off00005e74.bin
57addac7b62f6982da03a34d469d6734b49e3a67e494fbb995a28ec062f8da05
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E74 17996 bytes