Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6756ad84b83ed0d…

MALICIOUS

PDF

44.4 KB Created: 2021-06-09 02:45:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 87344823e4cffa2d20991ce5f3694c25 SHA-1: 3aa09368234cfc9da3b5ba083bf024d949d42ce8 SHA-256: f6756ad84b83ed0decf4292daa10382af0d14c2e6299b011a63663fe060c57e7
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into clicking a link. The embedded URL, https://netcdn.tw/app/431946152/how-to-get-free-roblox-iteams-game-hack, likely leads to a malicious download. The ML classifier also flagged this PDF as malicious with high confidence.

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/how-to-get-free-roblox-iteams-game-hack PDF link annotation
    • http://pustaka.pn-calang.go.id/repository/free-robux-no-human-verification-2021-pc_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/como-ser-hacker-en-roblox-mad-city_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-no-survey-2021-working-august_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/minecraft-bedrock-client_GM479516143.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_off00005189.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5189 24400 bytes
SHA-256: 62cbba661a86a0f5fba43c0e297e8e738d53bdc2909bb102c69e35401ad6c4ab
font_01_sfnt_off000089ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89AB 18704 bytes
SHA-256: 299596666860fd29f921f7042a4067173f422a776a6c4ae4ba9ad939ad83337c

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