Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e38c632ece60e99…

MALICIOUS

PDF

46.2 KB Created: 2021-06-03 06:48:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d6bc71005b62d5602aa9e98f65fdbc27 SHA-1: 127f0a74eeb0406b183e6a09fd62b2ff71959473 SHA-256: 9e38c632ece60e99a703a81628542bf8cd845873502fcf2dd43fbfee2b9d97fc
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into interacting with a malicious link. The embedded URL, https://netcdn.online/app/431946152/free-robux-generator-com-roblox-hack-game-hack, likely leads to a second-stage payload download. The ML classifier also flagged this PDF as malicious with high confidence.

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.online/app/431946152/free-robux-generator-com-roblox-hack-game-hack
    • http://www.samsoncc.com/uploaded_files/userfiles/files/free-coin-master-spins-for-today_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/coin-master-free-spins-apk_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/free-minecraft-windows-10-with-java_GM479516143.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/how-do-you-get-free-roblox-money_GM431946152.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/coin-master-hack-app-link_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/hack-coin-master-game-apk-download_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/how-do-u-hack-roblox_GM431946152.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/roblox-tix-generator_GM431946152.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/free-spin-coin-master-apk_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-25_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/mcpe-master-hack-coin-apk_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/roblox-hack-site_GM431946152.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/free-minecraft-codes_GM479516143.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/pokemon-go-free-stuff_GM1094591345.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/coun-master_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/is-java-minecraft-free_GM479516143.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/cm-free-spins-and-coins_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdf
    • http://www.samsoncc.com/uploaded_files/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052c6.bin
3603bbd9bb0a96aa003200faaff4b6cd33771ff7d834b29635c35e480f74211e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C6 27052 bytes
font_01_sfnt_off0000905f.bin
4f913a2277500713712aa6cd09c4e12b5f8093088fb24eab89a43b1b22929045		 pdf-font-stream PDF embedded font (sfnt) at offset 0x905F 18852 bytes

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