Malicious PDF — malware analysis report

Static analysis result for SHA-256 8410decaa5890a54…

MALICIOUS

PDF

34.2 KB Created: 2021-06-26 07:33:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7bfc9ae07363e3809ce0243c8f04bcfd SHA-1: dfbef807fbc7658b6830873d4507ec22008eac7b SHA-256: 8410decaa5890a544ecf456a408fbeb2a05599913273c88ae05bbf63b0d290e7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links, many of which are part of a link farm strategy, pointing to sites offering game hacks and free currency. The primary malicious URL is http://netcdn.co/app/431946152/roblox-hack-download-2021-android-game-hack, which is likely a downloader for a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblox-hack-download-2021-android-game-hack
    • https://encounternepal.com/userfiles/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/google-coin-master-free-spins_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/coin-master-official-website_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/hack-coin-master-mod-apk_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/free-robux-group-payouts_GM431946152.pdf
    • https://encounternepal.com/userfiles/files/give-me-robux_GM431946152.pdf
    • https://encounternepal.com/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/minecraft-hacks-xbox_GM479516143.pdf
    • https://encounternepal.com/userfiles/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdf
    • https://encounternepal.com/userfiles/files/robux-no-human-verification_GM431946152.pdf
    • https://encounternepal.com/userfiles/files/free-coins-coin-master-today_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/coin-master-free-coins-link_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/how-to-hack-coin-master_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/free-pet-food-for-coin-master_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/20-free-spins-coin-master_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-hack-2021_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/coin-master-2021-free-spins-link-2021_GM406889139.pdf
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdf
    • https://encounternepal.com/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdf
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-facebook_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e89.bin
fdbc38e8203870e288f4d3ddf6213e32a2910efd87f4ce304155f86b73b15fa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2E89 21840 bytes
font_01_sfnt_off00005e94.bin
f97f4b89094007417d0f1d1f35ca4f14748f0e987c129926e3f113d4311b7a12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E94 19684 bytes

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