Malicious PDF — malware analysis report

Static analysis result for SHA-256 7caef51d31884c70…

MALICIOUS

PDF

46.5 KB Created: 2021-05-12 06:52:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bcf55fc2fb24797a068f5049c74127a6 SHA-1: 86c186229038ea4ffab02d347d6557c3bb28edfa SHA-256: 7caef51d31884c70131eef0f622a4276ca7eff85a30631100f663261cb6976fd
102 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which appear to be part of an SEO link farm strategy, and one prominent URL pointing to a potential download. The ML classifier also flagged this PDF as malicious. These findings suggest the document is designed to redirect users to external sites that may host malware or facilitate phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/431946152/flame-gg-free-robux-game-hack
    • http://pustaka.ust.ac.id/repository/can-i-download-minecraft-for-free_GM479516143.pdf
    • http://pustaka.ust.ac.id/repository/coin-master-games-hack_GM406889139.pdf
    • http://pustaka.ust.ac.id/repository/does-roblox-premium-expire_GM431946152.pdf
    • http://pustaka.ust.ac.id/repository/free-robux-no-password_GM431946152.pdf
    • http://pustaka.ust.ac.id/repository/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdf
    • http://pustaka.ust.ac.id/repository/game-hunters-coin-master-free-spins_GM406889139.pdf
    • http://pustaka.ust.ac.id/repository/how-to-actually-get-free-robux_GM431946152.pdf
    • http://pustaka.ust.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdf
    • http://pustaka.ust.ac.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdf
    • http://pustaka.ust.ac.id/repository/coin-master-spin-hack-app_GM406889139.pdf
    • http://pustaka.ust.ac.id/repository/coin-master-daily-free-spins-link-haktuts_GM406889139.pdf
    • http://pustaka.ust.ac.id/repository/coin-master-apk-hack-mod-download_GM406889139.pdf
    • http://pustaka.ust.ac.id/repository/roblox-land-free-robux_GM431946152.pdf
    • http://pustaka.ust.ac.id/repository/free-promo-codes-roblox_GM431946152.pdf
    • http://pustaka.ust.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • http://pustaka.ust.ac.id/repository/mcpe-master-unlimited-coins-free-download_GM406889139.pdf
    • http://pustaka.ust.ac.id/repository/who-to-get-free-robux_GM431946152.pdf
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-hack_GM431946152.pdf
    • http://pustaka.ust.ac.id/repository/free-minecraft-skins-pe_GM479516143.pdf
    • http://pustaka.ust.ac.id/repository/how-do-you-get-free-roblox-money_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c7c.bin
3d29f278a040b462bcd45ebf7b6e8f71eb20bae5d5666a102faa8f368356f6c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C7C 25672 bytes
font_01_sfnt_off000087b1.bin
baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87B1 2844 bytes
font_02_sfnt_off00009173.bin
a12d67d537c0c2cb89f37f7f05ea7de5b6c0986bd532439e1b20da8093887b01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9173 18864 bytes

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