Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c488f4959aedc30…

MALICIOUS

PDF

32.9 KB Created: 2021-06-18 06:55:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7093c59000b87820af2d0b524bf03124 SHA-1: 30d41383b66a7fe0f8082b297d687bfc68b5dbd7 SHA-256: 9c488f4959aedc30f91c9167203734c5db35032c2b55ad1383a55b2e9f18a687
122 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources, many of which are related to game hacks and free in-game currency, indicating a lure for potentially malicious downloads. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external links, including a link farm heuristic, further supports this assessment. The document's content and structure suggest it is designed to trick users into visiting these links and downloading untrusted files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 5

  • 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.
  • 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 http://netcdn.co/app/431946152/free-dances-on-roblox-game-hack
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/coin-master-hack-apk-download-for-android_GM406889139.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/free-robux-no-verification-at-all_GM431946152.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/how-to-cheat-in-roblox-jailbreak-2021_GM431946152.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/free-spins-coin-master-without-completing-offers_GM406889139.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/roblox-rewards-site_GM431946152.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/coding-script-for-free-robux_GM431946152.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/coin-master-spin-free_GM406889139.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/free-robux-instantly_GM431946152.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/how-to-get-free-robux-hack_GM431946152.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/free-minecraft-mods-for-pc_GM479516143.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/robux-hack-no-human-verification-or-offers_GM431946152.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/earn-robux-today-earn-robux-today_GM431946152.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/free-robux-20219_GM431946152.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/roblox-games-free_GM431946152.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/free-robux-hack-no-verification_GM431946152.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/microsoft-free-robux_GM431946152.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/how-to-get-free-robux-without-verifying_GM431946152.pdf
    • http://elearning3.mtsn3subang.com/__statics/gudangsoal/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002cca.bin
4e73943b72641cc007c9a1c990465a1eefdfaccd7a90c869a113668949025e12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2CCA 21688 bytes
font_01_sfnt_off00005c51.bin
103a59e07e5e4945309869d31242f149fc202d98a3c43144e817aa0ace6d1550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C51 18816 bytes

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