Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4a45d5f2d1cfcc…

MALICIOUS

PDF

52.4 KB Created: 2021-06-03 05:39:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c1ea706694ca81c954b881f0388ba3e3 SHA-1: 6b5f282c44065ff579c417ad5616f10e1ead81e1 SHA-256: bc4a45d5f2d1cfcc5975bf1923a319ab2cb15625a572dc1affb665f90ad4e038
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are SEO-optimized links pointing to sites offering game-related cheats and currency, such as 'Roblox Earn Robux'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such external links, suggesting a link farm or phishing attempt. The presence of a 'download button' lure further supports the malicious intent of directing users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9586

Heuristics 4

  • 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.
  • 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/roblox-earn-robux-game-hack
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/free-robux-no-downloading-apps_GM431946152.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/sites-to-get-free-robux_GM431946152.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/coin-master-free-spins-link-hack_GM406889139.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/google-how-do-you-get-robux_GM431946152.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/coin-master-daily-free-spins-link-app-download_GM406889139.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/coin-master-free-spins-2021-generator_GM406889139.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/minecraft-cheats-switch_GM479516143.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/free-robux-site_GM431946152.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/master-coin-free-spin_GM406889139.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/free-tiktok-followers-generator_GM835599320.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/free-tiktok-accounts-with-followers_GM835599320.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/instant-free-spins-coin-master_GM406889139.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/how-to-get-more-spins-on-coin-master_GM406889139.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/codes-to-get-free-robux_GM431946152.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/free-robux-codes-2021-real_GM431946152.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/oprewards-com-login_GM431946152.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/free-robux-with-no-verification_GM431946152.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/android-coin-master-3433-apk-hack_GM406889139.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/games-that-give-you-free-robux_GM431946152.pdf
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/minecraft-xbox-one-code-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053a8.bin
dd953af3a1008bce5b3e9b99c184e7e348d7aa4aee2e7bfad5d043ff60ce9e04		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53A8 25992 bytes
font_01_sfnt_off00009009.bin
061a27b4d608dc836f0da6f5ae441d520cdaa2fe80e70f3de36c6ad0e5b2bd69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9009 8376 bytes
font_02_sfnt_off0000aada.bin
ac560818c0950b36a4d7f23f452e83199291727370614d0236bf7521a0e82fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAADA 18152 bytes

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