Malicious PDF — malware analysis report

Static analysis result for SHA-256 55367740bf258813…

MALICIOUS

PDF

45.6 KB Created: 2021-05-14 12:34:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7dc36a8d1150bd093239a6aad93b973d SHA-1: 8d49830fd3fff4df3c8e722ed7c7add6547385eb SHA-256: 55367740bf258813bb2d8deb3c9d7f7e7a489c1415875f6d9ecc7dc356cc41d6
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, designed to trick users into interacting with the document. It also embeds external URLs, one of which is directly linked to a potential reward hack, suggesting a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of embedded URLs and the fake CAPTCHA heuristic strongly indicate a malicious intent to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/431946152/op-rewards-robux-game-hack
    • https://www.e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/roblox-free-clothes-hack_GM431946152.pdf
    • https://www.e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/how-to-win-robux_GM431946152.pdf
    • https://e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/coin-hackhub-coin-master_GM406889139.pdf
    • https://www.e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdf
    • https://www.e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/coin-master-free-spins-cheats_GM406889139.pdf
    • https://www.e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/free-spins-coin-master-apple_GM406889139.pdf
    • https://www.e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/minecraft-free-apk-java-edition_GM479516143.pdf
    • https://e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • https://e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • https://e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/roblox-com-www_GM431946152.pdf
    • https://www.e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-builders-club_GM431946152.pdf
    • https://e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/coin-master-hack-cydia_GM406889139.pdf
    • https://www.e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/minecraft-tower-defense-hacked_GM479516143.pdf
    • https://e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • https://www.e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/is-minecraft-java-edition-free_GM479516143.pdf
    • https://e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/ro-ghoul-script_GM431946152.pdf
    • https://www.e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/free-roblox-codes-2021_GM431946152.pdf
    • https://www.e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/synapse-roblox-free_GM431946152.pdf
    • https://www.e-learning.man1majalengka.sch.id/__statics/gudangsoal/files/roblox-inappropriate_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ac1.bin
4f4fec148130ee5f93b0481e4dec761530aa39a1bf16acc85f7bc4367bd83382		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC1 25344 bytes
font_01_sfnt_off000084ba.bin
45bf821f81e84f4aa8d8374f492b182b36404f38b462c7dc471deaad6ab5c104		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84BA 2824 bytes
font_02_sfnt_off00008e67.bin
61fcf6890a53ac437d28a0a1b955c1ae9fc36ec45f89f4a8c20bebee047e4314		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E67 18592 bytes

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