Malicious PDF — malware analysis report

Static analysis result for SHA-256 7540c019e23b4c79…

MALICIOUS

PDF

44.5 KB Created: 2021-05-15 08:30:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9c38498a1817bbe8ecc7e9e266ce086c SHA-1: bfa37877342440c8c7d1a52171eea35e6dbc84a8 SHA-256: 7540c019e23b4c79159a27d1392f0f9eb964b10ac5ba1038169189042e475734
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt, a common social engineering tactic to trick users into interacting with malicious content. It also contains an external URI pointing to a URL associated with 'free robux' and other game-related lures, suggesting a phishing or scam attempt. No scripts were extracted, but the presence of external links and the fake CAPTCHA heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites or initiate downloads.

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/431946152/how-to-get-free-robux-not-a-scam-game-hack
    • https://www.e-starmagazine.com/uploads/files/free-robux-codes-no-human-verification_GM431946152.pdf
    • https://www.e-starmagazine.com/uploads/files/coin-master-connection-lost_GM406889139.pdf
    • https://www.e-starmagazine.com/uploads/files/i-got-hacked-on-roblox_GM431946152.pdf
    • https://www.e-starmagazine.com/uploads/files/free-spin-and-win-coin-master_GM406889139.pdf
    • https://www.e-starmagazine.com/uploads/files/minecraft-java-server-hosting-free_GM479516143.pdf
    • https://www.e-starmagazine.com/uploads/files/how-to-get-free-minecoins-in-minecraft_GM479516143.pdf
    • https://www.e-starmagazine.com/uploads/files/free-robux-no-verification-2021-ios_GM431946152.pdf
    • https://www.e-starmagazine.com/uploads/files/minecraft-complete-handbook_GM479516143.pdf
    • https://www.e-starmagazine.com/uploads/files/coin-master-free-2021-spin-link_GM406889139.pdf
    • https://www.e-starmagazine.com/uploads/files/coin-master-claim-spins_GM406889139.pdf
    • https://www.e-starmagazine.com/uploads/files/free-spins-coin-master-app_GM406889139.pdf
    • https://www.e-starmagazine.com/uploads/files/rewards-robux_GM431946152.pdf
    • https://www.e-starmagazine.com/uploads/files/today-coin-master-free-coins-link_GM406889139.pdf
    • https://www.e-starmagazine.com/uploads/files/huskybuscom-free-robux_GM431946152.pdf
    • https://www.e-starmagazine.com/uploads/files/blox-supply-free-robux_GM431946152.pdf
    • https://www.e-starmagazine.com/uploads/files/free-coin-and-spin-for-coin-master_GM406889139.pdf
    • https://www.e-starmagazine.com/uploads/files/coin-master-daily-free-coins-link_GM406889139.pdf
    • https://www.e-starmagazine.com/uploads/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://www.e-starmagazine.com/uploads/files/free-pe_GM479516143.pdf
    • https://www.e-starmagazine.com/uploads/files/free-coins-on-coin-master-generator_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c39.bin
922fb248cb6e256aa85c4b05fe3c26e377d574f4f147d45daa62e2f1911bf99b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C39 27216 bytes
font_01_sfnt_off00008a21.bin
022361ef70d0601eb321de045a15355e0ef134abc2a3262f50e5e6000d82738d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A21 18768 bytes