Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6fc822fb281dd3…

MALICIOUS

PDF

45.8 KB Created: 2021-06-09 02:34:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 70d64974cb85cba4913182cea38f799a SHA-1: 72abeae0e7be4d7b2eda209d9455edba20a20513 SHA-256: 3a6fc822fb281dd308e6e79fc4daac67bdd628160b40356c4c6871a677c279a9
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and a prominent download link, indicating a social engineering attempt to trick the user into downloading a payload. The ML classifier also flagged this PDF as malicious with high confidence. The primary URL associated with the download lure is https://netcdn.tw/app/431946152/hacks-to-get-free-robux-on-roblox-in-2021-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/hacks-to-get-free-robux-on-roblox-in-2021-game-hack
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-coins-2021_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/minecraft-java-for-free_GM479516143.pdf
    • https://pustaka.widyakartika.ac.id/repository/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdf
    • https://pustaka.widyakartika.ac.id/repository/get-coin-master-hack_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/free-roblox-clothes-templates_GM431946152.pdf
    • https://pustaka.widyakartika.ac.id/repository/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdf
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • https://pustaka.widyakartika.ac.id/repository/free-spin-app-for-coin-master_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/robuxhub-net_GM431946152.pdf
    • https://pustaka.widyakartika.ac.id/repository/haktuts-coin-master-free-spin-link-today_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spins-cheat_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spin-and-coin-link-app_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-gifts_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-free-roebucks-without-verification_GM431946152.pdf
    • https://pustaka.widyakartika.ac.id/repository/pokemon-go-free-kanto-event_GM1094591345.pdf
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-mighty-lion-card_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/pubg-600-uc-in-indian-rupees_GM1330123889.pdf
    • https://pustaka.widyakartika.ac.id/repository/minecraft-windows-10-hacked-client_GM479516143.pdf
    • https://pustaka.widyakartika.ac.id/repository/coin-master-rare-cards-hack_GM406889139.pdf
    • https://pustaka.widyakartika.ac.id/repository/coin-master-pc-hack-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000522d.bin
65b18952592a00265b4cab7c86cfdc71cc269d291b835a1adb32374eb8a0141c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x522D 26928 bytes
font_01_sfnt_off00008e67.bin
39dfa5c871216241ecb264b54e691f685d905c5159a301590e4dd0e79865bd76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E67 18992 bytes

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