Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4bc738011099dd…

MALICIOUS

PDF

46.0 KB Created: 2021-05-19 17:49:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e2fe2003e591e4a62d08e111060a6fad SHA-1: ac57df4ed64dc75e5619600ad8a70279a5914c98 SHA-256: 3c4bc738011099ddbde06c4601397c8b7e58dd3e5be0d472c11e3c5b182e5792
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick the user into interacting with a malicious link, likely for downloading a secondary payload. The embedded URLs and the document body content strongly suggest a lure related to game hacks or in-game currency. No scripts were extracted, limiting further analysis of execution flow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/free-daily-spins-from-coin-master-game-hack
    • http://winnerwater.com.tw/image/data/files/coin-master-real-hack_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/free-robux-generator-without-verification_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/coin-master-free-spins-app-for-iphone_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/how-to-buy-robux-for-free_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/give-me-robux-now_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/roblox-fun-com-free-robux_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/getrobux-come_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/coin-master_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/best-minecraft-hacked-client_GM479516143.pdf
    • http://winnerwater.com.tw/image/data/files/are-pubg-uc-cheap_GM1330123889.pdf
    • http://winnerwater.com.tw/image/data/files/coin-master-hack-2021-android-apk_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/free-robux-no-verification-no-survey_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/coin-master-free-spin-whatsapp-group_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/i-robux_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/free-roblox-girl-hair-not-a-model_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/coin-master-hack-apk-facebook-login_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/robux-generator-without-human-verification_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/games-that-give-free-robux_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/roblox-avatar-girl_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/free-spins-and-coins-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a7b.bin
c608188c15f707471916b612284d48bf37a26a545d07f42f2de0ac74f7a4aae4
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A7B 25660 bytes
font_01_sfnt_off00008682.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
pdf-font-stream PDF embedded font (sfnt) at offset 0x8682 2880 bytes
font_02_sfnt_off0000906d.bin
83a1403c7ea81f16df60b15bd3ed63af058033cc9f39ccf30f75695a9a8bc87e
pdf-font-stream PDF embedded font (sfnt) at offset 0x906D 18568 bytes