Malicious PDF — malware analysis report

Static analysis result for SHA-256 933f8f4b4fc1b172…

MALICIOUS

PDF

42.8 KB Created: 2021-05-19 11:32:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ba1c8bb77e0f33bb7c4235687cf8140a SHA-1: 19255886fa88fb67506a70c3408701fcefa362bd SHA-256: 933f8f4b4fc1b17247b26f78d837334bcb0e467b36e78fd27bee0634e35a1027
82 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a primary external URI pointing to applications promising free Robux, a common lure for malware distribution. The 'Password-protected archive handoff' heuristic suggests the document may be intended to trick users into downloading an encrypted payload, which is then accompanied by password instructions to bypass security filters. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/apps-to-get-free-robux-game-hack
    • http://www.oden.vn/upload/files/can-you-actually-get-free-robux_GM431946152.pdf
    • http://www.oden.vn/upload/files/minecraft-account-hacked_GM479516143.pdf
    • http://www.oden.vn/upload/files/free-robux-no-verification_GM431946152.pdf
    • http://www.oden.vn/upload/files/coin-master-hack-unlimited-spins_GM406889139.pdf
    • http://www.oden.vn/upload/files/coin-master-free-spins-link-2021-blogger_GM406889139.pdf
    • http://www.oden.vn/upload/files/coin-master-free-spins-link-may-2021_GM406889139.pdf
    • http://www.oden.vn/upload/files/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • http://www.oden.vn/upload/files/free-roblox-characters_GM431946152.pdf
    • http://www.oden.vn/upload/files/rbx-land-free-robux_GM431946152.pdf
    • http://www.oden.vn/upload/files/how-you-get-free-robux_GM431946152.pdf
    • http://www.oden.vn/upload/files/coin-master-free-spins-link-download-for-iphone_GM406889139.pdf
    • http://www.oden.vn/upload/files/free-robux-site_GM431946152.pdf
    • http://www.oden.vn/upload/files/tiktok-free-speech_GM835599320.pdf
    • http://www.oden.vn/upload/files/roblox-hack-2021_GM431946152.pdf
    • http://www.oden.vn/upload/files/coin-master-free-spin-and-coin_GM406889139.pdf
    • http://www.oden.vn/upload/files/minecraft-bedrock-free-download_GM479516143.pdf
    • http://www.oden.vn/upload/files/daily-coin-master-link_GM406889139.pdf
    • http://www.oden.vn/upload/files/coin-master-hacks-for-free-spins_GM406889139.pdf
    • http://www.oden.vn/upload/files/earn-free-spins-in-coin-master_GM406889139.pdf
    • http://www.oden.vn/upload/files/free-robux-hack-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000046d8.bin
6a726862d87b6540df3955d4aa5b69ff4afa085fd77633b9b398af5ac4a8ffdf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46D8 27064 bytes
font_01_sfnt_off000084c0.bin
b4e5860ebf2343f9b18b94d86a305cbc7e8ebd2f2a6bfe7ceeed88b67548d8bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84C0 18292 bytes

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