Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7866b3c5ebd5696…

MALICIOUS

PDF

40.9 KB Created: 2021-05-13 12:34:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0f1b327a8c6e90c7c11c7641bef7336b SHA-1: 6a08c583d625a668bf8472aab42b5a8683f1d535 SHA-256: b7866b3c5ebd5696c0824add2e2abac10ce67d6902db3bb396c6b061d520cfc7
82 Risk Score

Malware Insights

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

The sample is a PDF document that displays a fake CAPTCHA or human verification prompt to trick users into interacting with it. It contains an embedded URI pointing to a URL that offers 'Coin Master Cards Free Cards Hack', suggesting a lure for game cheats or similar content. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs indicates an attempt to redirect the user to a potentially malicious site for further action, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/coin-master-cards-free-cards-game-hack PDF link annotation
    • https://ethraa.ae/userfiles/files/hack-avatar_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-roblox-injector_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/wwwcoin-master-free-spincom_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/abd-roblox_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-hack-version-download-2021-ios_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-hack-2021-ios_GM406889139.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_003_off00004574.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4574 25416 bytes
SHA-256: 8b8f92862ca5d6aff5acb18ab1b79a2b88bfcd764b6a63ac50f5070c57aa57b8
font_01_sfnt_off00007eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB2 17884 bytes
SHA-256: d54aa51eaaaa3e2864f0114713409e316145a0183ee6aba9be1e443db1dceb19

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