Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6cc0334880fbe8…

MALICIOUS

PDF

48.6 KB Created: 2021-06-04 03:46:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 38ef403242124de6155521af1be444d4 SHA-1: 6c0b941ebbb5fb29b87b7686258b2e3ddbbf5bc9 SHA-256: 9b6cc0334880fbe89381f7c1de824868e53dc2fbfea478c5b578878b1aad319d
162 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and a large number of external links, many of which point to PDF files with SEO-optimized titles related to free Robux or game hacks. The primary URL, https://netcdn.online/app/431946152/free-robux-sites-that-work-game-hack, suggests a phishing or scam attempt. The document's structure and content indicate an attempt to trick users into clicking malicious links, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-sites-that-work-game-hack
    • http://e-library.dharmawangsa.ac.id/repository/free-spins-and-coins-coin-master_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-spins-android_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-hack-app-2021-download_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/websites-to-get-free-robux_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/robloxbux-us-generator_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/get-robux-for-free-2021_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/grab-points-login_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-change-your-name-in-roblox-for-free_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-coin-master-game_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/10-free-spins-coin-master_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-ios-gods-hack_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-without-survey_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-hack-fast-org_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-apk_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000507b.bin
8e82a7abe24f5e731722a02f2d7f2b477f0314eb629b5c5bef45ed4b868a9b50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x507B 25668 bytes
font_01_sfnt_off00008c35.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C35 5696 bytes
font_02_sfnt_off00009946.bin
c0bc6bb0706fab35ff455fc4816471a1ab7f6ae4486f691ef98043b3efa3f18d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9946 19000 bytes

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