Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b38e74e2f5d821…

MALICIOUS

PDF

47.6 KB Created: 2021-05-10 20:04:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ab0920efb0f5c613a3fccffce2c7f78d SHA-1: 76085d6bc1812ae82795e7c05599fe5d0c649699 SHA-256: a5b38e74e2f5d8212c39f2e13a5d35749122339952fe6b0aed5d79def35f49a6
142 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious lure, presenting a fake CAPTCHA to trick users into interacting with it. It contains a large number of external links, many of which point to files related to game cheats and hacks, suggesting a link farm designed to attract traffic or distribute further malware. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-spin-codes-coin-master-game-hack
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-apk-free-download_GM406889139.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/haktuts-coin-master-free-spin-link_GM406889139.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-game-hack-kaise-kare_GM406889139.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-do-you-get-free-robux_GM431946152.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-coins-and-spins-link-for-coin-master_GM406889139.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/google-play-coin-master-free-spins_GM406889139.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/facebook-coin-master-free-spins-link_GM406889139.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-coin-master-2021_GM406889139.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-no-verification-2021-ios_GM431946152.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-link-2021_GM406889139.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-robux-easy_GM431946152.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/hack-version-coin-master-apk_GM406889139.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/minecraft-pe-hack-client-2021_GM479516143.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/minecraft-pocket-edition-hack_GM479516143.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-cp_GM431946152.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-hack-ios_GM406889139.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-link_GM406889139.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-pro-gamers_GM406889139.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-robux-on-roblox_GM431946152.pdf
    • http://bpm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ce6.bin
7e783ac238f99b48bf8353dbb2a94bc518bcb1fa486e9e88836dcd1f80aaf861		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CE6 24316 bytes
font_01_sfnt_off000083d9.bin
e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D9 8676 bytes
font_02_sfnt_off00009863.bin
2136a1c0602e46c8a246992dca7dcdebcaf9a61ffc19b327be6d600db2c61793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9863 18060 bytes

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