Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5c273856f1c869…

MALICIOUS

PDF

47.5 KB Created: 2021-06-10 13:59:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4c9763948cbe878c44be547c39a16611 SHA-1: c7c0d01225dbd2f8426643d91c73c00439e0596a SHA-256: 4c5c273856f1c869a95252b9549757f7c12fda3752194974e6d6643f70a57478
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which are part of a link farm designed to appear as legitimate resources for game cheats and free in-game currency. The document also contains a lure for recovery secrets, suggesting a phishing or credential harvesting attempt. While no scripts were directly extracted, the PDF structure and embedded URIs indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.tw/app/431946152/how-to-gewt-free-robux-on-a-ipad-game-hack
    • https://lib.bunghatta.ac.id/app/repository/coin-master-heaven-free-spins-today_GM406889139.pdf
    • https://lib.bunghatta.ac.id/app/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdf
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/get-free-robux-without-human-verification_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/roblox-a-bizarre-day-cheats_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/free-robux-no-human-verification_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/free-daily-spins-coin-master_GM406889139.pdf
    • https://lib.bunghatta.ac.id/app/repository/free-coin-master-androd-cheats-2021_GM406889139.pdf
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-robux-on-phone_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/pokemon-go-free-gift-codes_GM1094591345.pdf
    • https://lib.bunghatta.ac.id/app/repository/robux-hacks-2021_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/minecraft-diamond-finder-hack_GM479516143.pdf
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • https://lib.bunghatta.ac.id/app/repository/como-hackear-para-tener-robux_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/can-you-earn-robux_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/coin-master-real-free-spins_GM406889139.pdf
    • https://lib.bunghatta.ac.id/app/repository/free-coin-master-game_GM406889139.pdf
    • https://lib.bunghatta.ac.id/app/repository/is-it-possible-to-get-free-robux_GM431946152.pdf
    • https://lib.bunghatta.ac.id/app/repository/free-spin-link-coin-master-today_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005441.bin
fe4f533909624b39a68c719ea350e34164a3f64efe2eb91f1dece9c39294fb8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5441 29384 bytes
font_01_sfnt_off0000959a.bin
eac0c6581a92df4f113d01b74fcb0d56430758c9d4dd1a9aa8c8cd0af780e56f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x959A 18860 bytes

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