Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f159b491b29ab6…

MALICIOUS

PDF

46.8 KB Created: 2021-06-08 11:15:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5185a15d4a542a4f140b58c36cfe5c12 SHA-1: 5c3896a9b54ef96ba69378ea6eecaf01fa2e74af SHA-256: 59f159b491b29ab6d8f502815e2f639bae353e0fc3c7f2578dd3e2a4bc71ce30
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 interacting with the document, likely to initiate a download. The embedded URL points to a resource that is likely a second-stage payload. The document's content and heuristics suggest a phishing or scam attempt, possibly leading to further malware execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9749

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/free-robux-secret-code-game-hack
    • http://deyuan-pc.com.tw/images/free-robux-app-2021_GM431946152.pdf
    • http://deyuan-pc.com.tw/images/real-free-robux-generator_GM431946152.pdf
    • http://deyuan-pc.com.tw/images/best-free-minecraft-server-hosting-reddit_GM479516143.pdf
    • http://deyuan-pc.com.tw/images/coin-master-free-spin-and-coins-links_GM406889139.pdf
    • http://deyuan-pc.com.tw/images/minecraft-tools_GM479516143.pdf
    • http://deyuan-pc.com.tw/images/minecraft-bedrock-server-hosting-free_GM479516143.pdf
    • http://deyuan-pc.com.tw/images/get-free-robux-2021_GM431946152.pdf
    • http://deyuan-pc.com.tw/images/is-minecraft-free-on-pc_GM479516143.pdf
    • http://deyuan-pc.com.tw/images/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdf
    • http://deyuan-pc.com.tw/images/free-minecraft-alts_GM479516143.pdf
    • http://deyuan-pc.com.tw/images/free-gfx-roblox_GM431946152.pdf
    • http://deyuan-pc.com.tw/images/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://deyuan-pc.com.tw/images/coin-master-hack-to-get-free-spins_GM406889139.pdf
    • http://deyuan-pc.com.tw/images/oprewards-com-earn_GM431946152.pdf
    • http://deyuan-pc.com.tw/images/tiktok-for-free_GM835599320.pdf
    • http://deyuan-pc.com.tw/images/pubg-uc-ykleme-hile_GM1330123889.pdf
    • http://deyuan-pc.com.tw/images/free-robux-for-kids_GM431946152.pdf
    • http://deyuan-pc.com.tw/images/how-to-hack-a-minecraft-server_GM479516143.pdf
    • http://deyuan-pc.com.tw/images/minecraft-pe-hack-client_GM479516143.pdf
    • http://deyuan-pc.com.tw/images/how-to-coin-master-spin-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051eb.bin
9238384d7a76782ca1cf95467f557470ecedafa7d92249e8c81756b4a38b1c9e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51EB 24488 bytes
font_01_sfnt_off00008a34.bin
77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A34 2832 bytes
font_02_sfnt_off000093e4.bin
350b7de085e8c015eb58bff5c64103d1e751950a1115ad34e6c2e8513069b2e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93E4 18292 bytes

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