Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb49e091af618f58…

MALICIOUS

PDF

44.9 KB Created: 2021-05-19 17:19:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a602c3ce834b4fe60eb5dd9fef3def0d SHA-1: a8ef27a753e067678d56eef50d190c0abfb4a12c SHA-256: fb49e091af618f58621bda55edda7e5e79fa7137c3212c510e2f42753ad5c3bc
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that displays a fake CAPTCHA or human verification prompt to lure the user into clicking a link. The embedded URL, https://netcdn.xyz/app/479516143/minecraft-pe-apk-game-hack, suggests the user is being enticed to download a game hack, which is likely a malicious payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/479516143/minecraft-pe-apk-game-hack
    • http://kukuck.de/images/free-spin-coin-master-link-2021_GM406889139.pdf
    • http://kukuck.de/images/coin-master-links-free-spins_GM406889139.pdf
    • http://kukuck.de/images/how-to-get-free-robux-gift-cards_GM431946152.pdf
    • http://kukuck.de/images/coin-master-free-coins-no-human-verification_GM406889139.pdf
    • http://kukuck.de/images/free-robux-2021_GM431946152.pdf
    • http://kukuck.de/images/coin-master-free-gold-cards_GM406889139.pdf
    • http://kukuck.de/images/coin-master-money-hack_GM406889139.pdf
    • http://kukuck.de/images/robuxy-com-free-robux_GM431946152.pdf
    • http://kukuck.de/images/coin-master-links-2021_GM406889139.pdf
    • http://kukuck.de/images/coin-master-free-spins-haktuts_GM406889139.pdf
    • http://kukuck.de/images/free-coin-master-spins-link_GM406889139.pdf
    • http://kukuck.de/images/free-robux-generator-without-human-verification_GM431946152.pdf
    • http://kukuck.de/images/free-spins-coin-master-november-2021_GM406889139.pdf
    • http://kukuck.de/images/how-to-get-free-pet-food-in-coin-master_GM406889139.pdf
    • http://kukuck.de/images/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://kukuck.de/images/oprewards-free-robux_GM431946152.pdf
    • http://kukuck.de/images/rbx-claim_GM431946152.pdf
    • http://kukuck.de/images/coin-master-free-coins-link-2021_GM406889139.pdf
    • http://kukuck.de/images/how-do-i-get-free-robux_GM431946152.pdf
    • http://kukuck.de/images/free-robux-pin-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ad8.bin
20707ebf6697f0608c3507872ac0918e8e86b1615db460dd555dbab2cdca262e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AD8 30472 bytes
font_01_sfnt_off00008e17.bin
5fbed8632119c253af4b9ab7dc246da20067eac7641579129df9e72f6a1f5ea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E17 18068 bytes

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