Malicious PDF — malware analysis report

Static analysis result for SHA-256 691e2e78db2adb39…

MALICIOUS

PDF

45.9 KB Created: 2021-05-15 09:54:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b3020ff260d8db78c44eced829125635 SHA-1: d18ad595bbec9272c497806ce6b7b9168fba1946 SHA-256: 691e2e78db2adb39137e6d86eba63ea9bc50ab25c82c7daeed82f213cb1bb7be
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA or human verification prompt, a common social engineering tactic to trick users into clicking malicious links. The embedded URL, https://netcdn.xyz/app/406889139/gameoffice-net-hack-coin-master-game-hack, likely leads to a malicious download or scam page. The ML classifier also flagged this PDF as malicious with high confidence.

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/gameoffice-net-hack-coin-master-game-hack
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/how-to-hack-someones-account-on-roblox_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/free-coins-and-spins-in-coin-master_GM406889139.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/coin-master-50-spin-link_GM406889139.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/how-to-earn-free-robux_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/free-robux-survey_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/how-do-you-get-free-robux_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/gamehunters-club-coin-master_GM406889139.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/coin-master-hack-ios-no-jailbreak_GM406889139.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/free-minecraft-worlds_GM479516143.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/master-coin-hack-apk_GM406889139.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/minecraft-realms-free_GM479516143.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/free-roblox-gift-card-codes-2021-unused_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/free-robux-no-verification-or-survey-2021_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/codes-how-to-get-free-robux_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/free-robux-no-verify-2021_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/games-like-coin-master-for-free_GM406889139.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/how-to-get-spins-on-coin-master-hack_GM406889139.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/easy-ways-to-get-free-robux_GM431946152.pdf
    • https://www.wellonaindia.com/uploaded_files/userfiles/files/free-robux-now_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cfd.bin
135c5395aea94379fccf56404977b1f50073848a327a1631b2f8a529c0dd43b6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CFD 26288 bytes
font_01_sfnt_off000087cf.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87CF 2880 bytes
font_02_sfnt_off000091ba.bin
c1b1a17e523e936b349f536870acacfad228736640955d12968774eefee3ad4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91BA 17976 bytes

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