Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a4ce56b6242704…

MALICIOUS

PDF

42.0 KB Created: 2021-05-10 15:36:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 38981ffc9c32ae948ded7ce4cfb338ba SHA-1: 9439f430348467cb711b975a1956e2ac4bf28aaa SHA-256: 43a4ce56b624270456c8cdd358040e2ccf8f5fd917a0cc7086507d9b6156520c
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA, a common lure to trick users into clicking malicious links or executing commands. The presence of multiple external URLs, including one pointing to a potential executable download, strongly suggests the document is designed to lead the user to download and run a second-stage payload. No scripts were extracted, limiting further analysis of the execution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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/optifine-minecraft-pe-game-hack
    • https://dinpertan.grobogan.go.id/images/is-minecraft-free-on-xbox-one_GM479516143.pdf
    • https://dinpertan.grobogan.go.id/images/free-robux-com-roblox_GM431946152.pdf
    • https://dinpertan.grobogan.go.id/images/how-you-get-robux_GM431946152.pdf
    • https://dinpertan.grobogan.go.id/images/roblox-devil_GM431946152.pdf
    • https://dinpertan.grobogan.go.id/images/coin-master-free-spins-android_GM406889139.pdf
    • https://dinpertan.grobogan.go.id/images/coin-master-free-spin-link-list_GM406889139.pdf
    • https://dinpertan.grobogan.go.id/images/coin-master-daily-free-spins-2021_GM406889139.pdf
    • https://dinpertan.grobogan.go.id/images/robuxmatchcom-free-robux_GM431946152.pdf
    • https://dinpertan.grobogan.go.id/images/free-400-spins-coins-master_GM406889139.pdf
    • https://dinpertan.grobogan.go.id/images/how-to-hack-peoples-roblox-accounts_GM431946152.pdf
    • https://dinpertan.grobogan.go.id/images/roblox-pics_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000044ee.bin
b8e3b7fbac7bc4ed9779c59fe0a62c8236f5bf563589ac2c9f9d53dbeaeb09bc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x44EE 28116 bytes
font_01_sfnt_off000083df.bin
329d7ab062be7e0d43787b7f833dde7fd9b3bb9f29dbab3fb3d55d3ae74c040a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83DF 17896 bytes

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