Malicious PDF — malware analysis report

Static analysis result for SHA-256 7139ca4341cb246e…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 00:36:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 33e2f385fd95c173942f281f130a5ed6 SHA-1: e7423294ece9dcc01c81944eac34872ae9043b5c SHA-256: 7139ca4341cb246e0b6bfba799baa6edf8b904b43ecd853a4935c81bbd83a16a
82 Risk Score

Malware Insights

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

The PDF document contains a lure for 'Free Robux' and includes an external URI pointing to a suspicious domain. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'download button' heuristic and a 'password archive lure' suggests a multi-stage attack where the user is tricked into downloading and potentially decrypting a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/claim-free-robux-game-hack
    • http://library.futureuniversity.com/repository/how-to-get-free-robux-without-verifying_GM431946152.pdf
    • http://library.futureuniversity.com/repository/coin-master-hack-tuts_GM406889139.pdf
    • http://library.futureuniversity.com/repository/how-to-hack-any-roblox-account_GM431946152.pdf
    • http://library.futureuniversity.com/repository/roblox-lumber-tycoon-2-cheat-codes_GM431946152.pdf
    • http://library.futureuniversity.com/repository/free-roblox-accounts-and-passwords-in-roblox-shown-on-wikia_GM431946152.pdf
    • http://library.futureuniversity.com/repository/how-many-levels-does-coin-master-have_GM406889139.pdf
    • http://library.futureuniversity.com/repository/how-to-get-free-robux-gift-cards_GM431946152.pdf
    • http://library.futureuniversity.com/repository/how-to-change-your-roblox-username-for-free_GM431946152.pdf
    • http://library.futureuniversity.com/repository/hacking-tool-roblox_GM431946152.pdf
    • http://library.futureuniversity.com/repository/robux-free-co_GM431946152.pdf
    • http://library.futureuniversity.com/repository/coin-master-free-spins-promo-code_GM406889139.pdf
    • http://library.futureuniversity.com/repository/coin-master-hack-without-verification_GM406889139.pdf
    • http://library.futureuniversity.com/repository/robux-page_GM431946152.pdf
    • http://library.futureuniversity.com/repository/minecraft-apk-free-download-016-0_GM479516143.pdf
    • http://library.futureuniversity.com/repository/lumber-tycoon-2-glitch-to-get-free-robux_GM431946152.pdf
    • http://library.futureuniversity.com/repository/freer-robux-codes_GM431946152.pdf
    • http://library.futureuniversity.com/repository/roblox-play-now-for-free_GM431946152.pdf
    • http://library.futureuniversity.com/repository/coin-master-heaven-free-spins-today_GM406889139.pdf
    • http://library.futureuniversity.com/repository/free-vip-roblox_GM431946152.pdf
    • http://library.futureuniversity.com/repository/how-do-you-earn-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_off000031e0.bin
a79866276b9a86fd5462f9a03d0ba6bcf5fe5ef7275c7e43995c4e33691845a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31E0 22500 bytes
font_01_sfnt_off00006409.bin
dfc8721fbf6b4988d00971a58b16fe325011594e1ee6efadf5a4fdcf2df05fca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6409 19168 bytes

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