Malicious PDF — malware analysis report

Static analysis result for SHA-256 861c2b2f95bc7f46…

MALICIOUS

PDF

45.6 KB Created: 2021-06-09 00:35:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9cbeec4c58e5100f9effe8fe7b10e450 SHA-1: 0b8cb34c68543b1674fdb247893a12dd5fdc8a39 SHA-256: 861c2b2f95bc7f4691a41c39f93572c9d6c873c6c83fdf376b995ffb84053ac9
122 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a lure, presenting a fake CAPTCHA and a download button to entice users to click on a link. This link, 'https://netcdn.tw/app/431946152/10-easy-ways-to-get-free-robux-game-hack', is associated with game hacks and likely serves as a redirector to a malicious payload. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/431946152/10-easy-ways-to-get-free-robux-game-hack PDF link annotation
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/money-cheats-for-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/roblox-ballon-simolator-gem-hack_GM431946152.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/free-robux_GM431946152.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/how-to-people-hack-into-your-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.elearning.madupurwogondo.sch.id/__statics/gudangsoal/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000544e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x544E 24768 bytes
SHA-256: b8c826f7c6740497c83ed7f95ad7f25a92d1f54cfa1ec22c0c609edb280ec690
font_01_sfnt_off00008d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D36 19000 bytes
SHA-256: a4dfb5aabe30ec7d39db65ddeda70e35279a73dd4d046d59752405af3f3afcd7

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