Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81d2aa9e873d055…

MALICIOUS

PDF

47.9 KB Created: 2021-06-03 06:13:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 09b12326d09892bd429e08c9c626509d SHA-1: 6d476951e05df451909a9e693c8b2016e3bc2edc SHA-256: a81d2aa9e873d055f6b699295823dfec67e06cb3b49ce7e4d324bfadb3db6227
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, a common social engineering tactic to trick users into interacting with malicious content. It also embeds external URIs, including one pointing to 'netcdn.online', which likely serves as a download host for a secondary payload. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/robux-fun-hack-game-hack
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id//repository/can-i-get-free-pubg-uc_GM1330123889.pdf
    • http://perpus.poltekeskupang.ac.id/repository/robux-win_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id//repository/get-coin-master-cards-free_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id//repository/link-coin-master_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-free-spins-twitter_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/free-robux-hacker-us_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id/repository/how-to-get-free-robux-2021-easy_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-hack-100-working_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id//repository/free-robux-promo-codes-2021_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-free_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/free-executor-roblox_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-hack-no-human-verification_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/free-coin-master-spins-link-facebook_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/try-minecraft-free_GM479516143.pdf
    • http://perpus.poltekeskupang.ac.id/repository/rbx-land-free-robux_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-new-cards-hack_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id//repository/http-coin-master-hack-club_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id//repository/roblox-free-no-download_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e9b.bin
6e9581cce243b6b957a2eec3018dc4f05110f7cdc38ce6dd0eefb72221a129d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E9B 27660 bytes
font_01_sfnt_off00008e4f.bin
78e89c8f621d90011ffb7a2107d701d4cdf090a2f2cf42d5a65297289afc8805		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E4F 2832 bytes
font_02_sfnt_off00009800.bin
5f8acd8ad37749349105b070ed73c2c3c7a96b7e2283405d761bfe738e73485c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9800 18412 bytes

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