Malicious PDF — malware analysis report

Static analysis result for SHA-256 0371d9e952e22c1e…

MALICIOUS

PDF

44.7 KB Created: 2021-05-14 10:32:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a96a85691ae63acb7c6397e63ba1a926 SHA-1: 2a92434df00682dc49e9a78edfebd7c33eaa3e0b SHA-256: 0371d9e952e22c1e2919c580ffa1c078c76763fe80ec22ba602d159e0bf81a54
82 Risk Score

Malware Insights

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

The document uses a fake CAPTCHA lure to trick users into downloading potentially malicious files from external URLs. The presence of a fake CAPTCHA and a call-to-action button strongly suggests a social engineering attempt to lead the user to a malicious download. The ML classifier also flagged this PDF as malicious with high confidence.

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/free-robux-generator-no-human-verification-or-surveys-game-hack
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/minecraft-hack-app_GM479516143.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/spinuri-gratis-coin-master_GM406889139.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/village-coin_GM406889139.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/minecraft-windows-10-key-free_GM479516143.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/robux-earner_GM431946152.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/how-to-change-your-username-in-roblox-for-free_GM431946152.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/free-robux-now_GM431946152.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/free-robux-that-actually-works-2021_GM431946152.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/blogger-coin-master-free-spins_GM406889139.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/roblox-gift-card-free-codes_GM431946152.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/coin-and-spin_GM406889139.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-coins-link_GM406889139.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-cards_GM406889139.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/free-minecraft-skins-pe_GM479516143.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-hack-link_GM406889139.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/coin-master-time-hack-ios_GM406889139.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/robux-giver_GM431946152.pdf
    • https://www.smkpgri2bdg.sch.id/new/public/ckfinder/userfiles/files/can-i-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c6e.bin
b8bac02bf4253eb2d1a481bed470b381ca6f22c234928f649704a7bb1c1955da		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C6E 26972 bytes
font_01_sfnt_off00008a13.bin
b23a4dbd5b2cf0eeb4dbb5626642de4de2979fce29ecd3df28c5d1ef95471ce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A13 19156 bytes

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