Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c243161dc781f0…

MALICIOUS

PDF

47.7 KB Created: 2021-05-17 01:48:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d414554e08399ed75857195e69a9b68e SHA-1: a1d65ce2a9844210c0d952501db7cd8b542f9218 SHA-256: f3c243161dc781f0a78c5829508568265a1d553dbc542fd09470b9dd74af88d4
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and a document body that attempts to lure the user into clicking links for free in-game items, such as Robux. The presence of a 'Password-protected archive handoff' heuristic suggests that the linked content may be an encrypted payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/how-to-get-free-robux-without-download-apps-or-survey-game-hack
    • http://bogatyr.com/images/coin-master-free-spins-a2z-help_GM406889139.pdf
    • http://bogatyr.com/images/daily-free-spins-on-coin-master_GM406889139.pdf
    • http://bogatyr.com/images/roblox-weird_GM431946152.pdf
    • http://bogatyr.com/images/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdf
    • http://bogatyr.com/images/free-robux-hack-2021_GM431946152.pdf
    • http://bogatyr.com/images/roblox-com-r_GM431946152.pdf
    • http://bogatyr.com/images/free-100-robux_GM431946152.pdf
    • http://bogatyr.com/images/roblox-old-avatar_GM431946152.pdf
    • http://bogatyr.com/images/coin-master-hack-pc-2021_GM406889139.pdf
    • http://bogatyr.com/images/free-coin-master-links_GM406889139.pdf
    • http://bogatyr.com/images/coin-master-hack-co_GM406889139.pdf
    • http://bogatyr.com/images/minecraft-pocket-edition-free_GM479516143.pdf
    • http://bogatyr.com/images/coin-master-free-spins-cheat_GM406889139.pdf
    • http://bogatyr.com/images/can-you-give-me-free-robux_GM431946152.pdf
    • http://bogatyr.com/images/coin-master-free-spin-game_GM406889139.pdf
    • http://bogatyr.com/images/how-to-download-minecraft-for-free-on-pc_GM479516143.pdf
    • http://bogatyr.com/images/how-to-get-free-unlimited-robux_GM431946152.pdf
    • http://bogatyr.com/images/coin-master-heaven-free-spins_GM406889139.pdf
    • http://bogatyr.com/images/free-roblox-generator_GM431946152.pdf
    • http://bogatyr.com/images/how-to-buy-robux-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a1c.bin
596b5e5cfd9f3cf92032037764947604ff8eec857fe9035fa7c7d5e390f57715		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A1C 28896 bytes
font_01_sfnt_off00008987.bin
baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8987 2844 bytes
font_02_sfnt_off00009348.bin
a2325719e7076f7032f87f435cdda87ec67b0b67db20430c9492992df634e2b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9348 19880 bytes

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