Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dec2f8ccfc9f94…

MALICIOUS

PDF

33.9 KB Created: 2021-07-06 11:13:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 474c0a578ca6ae591f64fb56bc9a65fe SHA-1: 8509ee6d40ba7f7a0fdd1f3fd6e4865699b9e8cc SHA-256: c8dec2f8ccfc9f9480c84d3a620e605de9dff5eed9456cd15be14774b610e7fb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized pages for game cheats and hacks. The primary URL, http://netcdn.tw/app/431946152/earn-robux-game-hack, suggests a lure for free Robux, a common tactic for distributing malware. The ML classifier strongly indicates maliciousness, supporting the conclusion that this document is designed to redirect users to potentially harmful content.

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/431946152/earn-robux-game-hack PDF link annotation
    • https://perpus.upp.ac.id/digilib/repository/cheat-bubble-gum-simulator-de-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-dick-hack_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/best-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-group-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/wurst-18-9_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-can-i-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-robot-simulator-hack_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-spins-daily-1-ga_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F6D 22208 bytes
SHA-256: f6d47eb55218002e1742758c76c92e137d3c03ca99740fff3eec4b164df22cba
font_01_sfnt_off000060c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C9 18552 bytes
SHA-256: 8543300a06bd5f627884b1343b9e13e647e2bd11d135b956d7c374330d8d3701

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