Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a3c5d892b5fe55…

MALICIOUS

PDF

43.9 KB Created: 2021-06-09 01:20:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ec7387f6e26846b5bcff6f193c6af7ab SHA-1: e4cb8da0b6cdfe6fe0850003a5e9015e6179d939 SHA-256: a1a3c5d892b5fe55da223ade9bf39e4a1864b8e99dacd71265008fc3ce54c97f
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, aiming to trick the user into interacting with a malicious link. The embedded URL and numerous other URLs point to sites offering game hacks and generators, suggesting a scam or malware distribution. No scripts were extracted, but the overall pattern indicates a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/assassin-item-hacks-roblox-game-hack PDF link annotation
    • https://vierabyragazze.com/upload/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-hack-someones-roblox-account-for-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/robloxbux-us-generator_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/is-roblox-being-hacked-right-now_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-rewards_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/minecraft-for-macbook-free_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-hack-someones-character-in-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f15.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F15 25272 bytes
SHA-256: cdc7b6efee3b100b426b7d0f8749f11d9f6b436cc2736b4766b3832c88e693ff
font_01_sfnt_off000087c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C8 18664 bytes
SHA-256: 33b5b5da644bd50d16526749ae421787124a678c6422dd30e08830a7485a0186

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