Malicious PDF — malware analysis report

Static analysis result for SHA-256 4842ecae76c197f5…

MALICIOUS

PDF

44.0 KB Created: 2021-05-12 12:31:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: eb8da80fe95e84e998cb9221a86a2fc0 SHA-1: 6d91c132b74719d1b9802d035520431b270d359a SHA-256: 4842ecae76c197f591de364f9a70fce7b1deb63dd2bfa0f4e8e0de17e299c1f0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are part of a link farm designed to mimic search engine results for game hacks and cheats. The document body, though heavily obfuscated, contains references to 'Roblox Free Clothes Generator' and a URL associated with game hacks. The presence of a PDF_URI heuristic firing and the ML_NYX_PDF_MALICIOUS flag indicate a high likelihood of malicious intent, likely to direct users to malicious websites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-free-clothes-generator-game-hack
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/coin-master-hack-version-2021-download_GM406889139.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/blogspot-free-spins-coin-master_GM406889139.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu//repository/hack-coin-master-for-free_GM406889139.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu//repository/coin-coin-master-hack_GM406889139.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/coin-master-daily-free-spin-and-coin-link_GM406889139.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu//repository/today-free-spin-coin-master_GM406889139.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu//repository/coin-master-34-4-hack_GM406889139.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu//repository/get-free-spins-in-coin-master_GM406889139.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu//repository/free-robux-real-2021_GM431946152.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/free-spin-link-coin-master-app_GM406889139.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu//repository/android-coin-master-3433-apk-hack_GM406889139.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu//repository/coin-master-hack-without-verification_GM406889139.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu//repository/coin-master-free-spin-today_GM406889139.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/free-robux-no-anti-bot-verification_GM431946152.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu//repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu//repository/coin-master-hack-app-android-download_GM406889139.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/minecraft-marketplace-free_GM479516143.pdf
    • http://perpustakaan.litbang.kemkes.go.id/tawangmangu/repository/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d46.bin
1897bf4b2e64d5a5d380a775ee0253cf3c896f59c00876dae301f1d3c54af452		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D46 25680 bytes
font_01_sfnt_off0000890c.bin
afe4d80e9b307905d1b46577691458e01dbb921fe666fe9998ea064ff4a1b434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x890C 18448 bytes

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