Malicious PDF — malware analysis report

Static analysis result for SHA-256 688a491060c79e58…

MALICIOUS

PDF

39.7 KB Created: 2021-05-23 12:10:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b0573e08a9e6bb1462c637a8e714a8b7 SHA-1: de300d47184c173df23396e047bfb9a8b42037dc SHA-256: 688a491060c79e584026bc8cec9fc0e5ececa373befa091b66aab51cb5f2980a
142 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a lure for free Robux, aiming to trick users into clicking malicious links. The embedded URLs point to sites offering game-related cheats or hacks, which are common pretexts for phishing or malware distribution. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/can-you-get-robux-for-free-game-hack
    • http://ghknights.org/images/how-to-hack-coin-master-spin-ios_GM406889139.pdf
    • https://www.ghknights.org/images/free-appsfor-coin-master-daily-rewards_GM406889139.pdf
    • http://ghknights.org/images/coin-master-daily-free-spins-link-2021_GM406889139.pdf
    • https://www.ghknights.org/images/roblox-redeem-codes-free_GM431946152.pdf
    • http://ghknights.org/images/robux-converter_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000338c.bin
1892ac77dd8632a1ca486e20af188f064d3683ed27e217770731bc0112e2c7e3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x338C 25680 bytes
font_01_sfnt_off00006ee7.bin
552e62132cae3603ce0819827e44d96a992bd06014cc5080bf3af4b2ea155b3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE7 2880 bytes
font_02_sfnt_off000078bf.bin
c061b59ab901ec7c7e5d17bc5fec7ace191fd36e08e64edc0ca642be8bf86a0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BF 18508 bytes

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