Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a441278934f57e…

MALICIOUS

PDF

43.2 KB Created: 2021-05-13 04:39:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b6174734b32a3ebb22738f255316a2e0 SHA-1: 7bcca7be41eba18a9679cec1e4f5e6b44e7dc5d8 SHA-256: 72a441278934f57e3c77a4aff4e8e42c6e403de6aeb000ecda628a5c4918d31d
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with the document. It also embeds multiple URLs, including one pointing to 'netcdn.xyz', which likely serve as download locations for malicious payloads. The presence of these elements strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/rbxoffer-com-free-robux-game-hack
    • http://bassacctaxservices.com/images/coin-master-free-spins-hack_GM406889139.pdf
    • http://bassacctaxservices.com/images/coin-master-free-spins-for-today_GM406889139.pdf
    • http://bassacctaxservices.com/images/hack-coin-master-android-2021_GM406889139.pdf
    • http://bassacctaxservices.com/images/coin-master-daily-spins-and-coins_GM406889139.pdf
    • http://bassacctaxservices.com/images/free-minecraft-games-for-kids_GM479516143.pdf
    • http://bassacctaxservices.com/images/coin-master-free-spins-promo-code_GM406889139.pdf
    • http://bassacctaxservices.com/images/how-to-hack-roblox-jailbreak_GM431946152.pdf
    • http://bassacctaxservices.com/images/coin-master-hacks_GM406889139.pdf
    • http://bassacctaxservices.com/images/free-gfx-roblox_GM431946152.pdf
    • http://bassacctaxservices.com/images/coin-master-hack-using-lucky-patcher_GM406889139.pdf
    • http://bassacctaxservices.com/images/robuxglobalcom_GM431946152.pdf
    • http://bassacctaxservices.com/images/coin-master-hacks-for-android_GM406889139.pdf
    • http://bassacctaxservices.com/images/orewards-com-free-robux_GM431946152.pdf
    • http://bassacctaxservices.com/images/free-robux-generator-no-human-verification_GM431946152.pdf
    • http://bassacctaxservices.com/images/free-coins-coin-master_GM406889139.pdf
    • http://bassacctaxservices.com/images/uprobuxcom-free-robux_GM431946152.pdf
    • http://bassacctaxservices.com/images/coin-master-free-spins-hack-no-human-verification_GM406889139.pdf
    • http://bassacctaxservices.com/images/free-minecraft-hacks_GM479516143.pdf
    • http://bassacctaxservices.com/images/funbloxxyz-free-robux_GM431946152.pdf
    • http://bassacctaxservices.com/images/roblox-com-games-referrer-roblox-player_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a3d.bin
7e01eacc8924b6df10f974d70891908579d9d25f3f79d01e2d9a633df61caf11		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A3D 26132 bytes
font_01_sfnt_off000086e1.bin
9aeb6f41d3354634239b7c8beac9b422ae3978a513a1679011b82127add4d155		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86E1 18276 bytes

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