Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bbda64437cde45…

MALICIOUS

PDF

44.8 KB Created: 2021-05-17 10:34:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: db8e8ad8005300b40d7d3ce46e6588a1 SHA-1: 70f9f26bf208ba512aba7dc9be0cc0a7cf705f74 SHA-256: e4bbda64437cde456d2497f7ac54d7bdae1c1ef0f42614e7811a303c1ede9b8c
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA lure to deceive users into downloading further malicious content, as indicated by the 'SE_FAKE_CAPTCHA' heuristic. The embedded URL, 'https://netcdn.xyz/app/406889139/coin-master-hack-apk-app-game-hack', likely serves as the download source for a secondary payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/406889139/coin-master-hack-apk-app-game-hack
    • http://addair.co.uk/images/free-links-coin-master_GM406889139.pdf
    • http://addair.co.uk/images/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • http://addair.co.uk/images/free-coin-master-spins-2021_GM406889139.pdf
    • http://addair.co.uk/images/buy-robux-free_GM431946152.pdf
    • http://addair.co.uk/images/how-to-get-free-robux-hack_GM431946152.pdf
    • http://addair.co.uk/images/coin-master-free-spin-and-coin-links_GM406889139.pdf
    • http://addair.co.uk/images/google-moon-active_GM406889139.pdf
    • http://addair.co.uk/images/how-to-hack-people-on-roblox_GM431946152.pdf
    • http://addair.co.uk/images/oprewards-robux_GM431946152.pdf
    • http://addair.co.uk/images/roblox-studio-free_GM431946152.pdf
    • http://addair.co.uk/images/roblox-generator_GM431946152.pdf
    • http://addair.co.uk/images/free-robux-not-a-scam_GM431946152.pdf
    • http://addair.co.uk/images/minecraft-free-unblocked_GM479516143.pdf
    • http://addair.co.uk/images/free-spins-coin-master-no-verification_GM406889139.pdf
    • http://addair.co.uk/images/roblox-got-talent-piano-hack_GM431946152.pdf
    • http://addair.co.uk/images/coin-master-free-spins-link-ios_GM406889139.pdf
    • http://addair.co.uk/images/how-to-get-minecraft-pe-for-free_GM479516143.pdf
    • http://addair.co.uk/images/roblox-but_GM431946152.pdf
    • http://addair.co.uk/images/free-spins-coin-master-links_GM406889139.pdf
    • http://addair.co.uk/images/hacks-and-cheats-for-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ae6.bin
42e6af21a22d4ffb71c1e499ac8144319e17562a5061ecbb85aa3e6c91db4d99		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE6 24236 bytes
font_01_sfnt_off00008297.bin
9967c6221325a4ff3f7c4336922605f990450164c2eee2df708cc81823c6ec98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8297 3124 bytes
font_02_sfnt_off00008d75.bin
f939fda97690d6a809d743b342add8ec97984f5e978608423f32dd39679c4d64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D75 17892 bytes

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