Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d1058020f204c4…

MALICIOUS

PDF

47.8 KB Created: 2021-06-13 20:29:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 04cd1594c863d927affd1fb1ac46bb08 SHA-1: ad58c18d56948d7df2fd040e4b5b53781b7990a8 SHA-256: a3d1058020f204c40d99c26767249abc4457bd916888670203cb9236c789e631
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into interacting with a malicious link. The ML classifier also flagged this PDF as malicious. The primary IOC is the external URI pointing to a potential payload download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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 http://netcdn.co/app/431946152/free-game-passes-vehicle-simulator-roblox-2021-game-hack
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-get-free-spins-for-coin-master_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/hacks-on-roblox-prison-life_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/robuxmatch-com-free-robux_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-roblox-jailbreak-account_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/roblox-how-to-get-the-free-trial-trial-bc_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-girl-hair-roblox_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/play-roblox-for-free-on-google_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/pokemon-go-free-zekrom-counters_GM1094591345.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/minecraft-free-unblocked_GM479516143.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-hack-coin-master-ios_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-free-robux_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-spin-coin-master-iphone_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/minecraft-apk-android-free_GM479516143.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-robux-apk_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/easy-points-gg_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-fan-page-free-spins_GM406889139.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-robux-generator-2021-no-human-verification_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/minecraft-thumbnail-maker-free_GM479516143.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdf
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/mine-minecraft-games-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d7b.bin
9b637587e03ed20b50e64e7d1f0bb85ce4a85e28bee63de22fbda320f3aae9fe		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D7B 26552 bytes
font_01_sfnt_off00008a79.bin
eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A79 2940 bytes
font_02_sfnt_off00009488.bin
953e4cbadff97f5dfd9b287835ac918c54d38b46f461f6c0ceb48d9b3087dd7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9488 19656 bytes

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