Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd5263ca703037b…

MALICIOUS

PDF

34.1 KB Created: 2021-07-07 11:18:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 18cd818cfc747ce17b6990cb37a1f40b SHA-1: 86cc716f71f923ca5b14ae78f9212235dc68a2b9 SHA-256: afd5263ca703037bff2c4de9dc16acd09a2b1d40176fc819992fd5a2dc99ce6e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, including a primary link to 'netcdn.tw' which appears to host a modified application. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract traffic. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or malware distribution scheme.

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.tw/app/406889139/coin-master-mod-apk-hack-game-hack
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/coin-master-heaven-free-spins_GM406889139.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/roblox-codes-to-get-free-stuff-2021_GM431946152.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/exploit-free-roblox-not-win-rar_GM431946152.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/free-minecraft-java-account_GM479516143.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/free-coin-master-spins-hack_GM406889139.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/open-rewards-free-robux_GM431946152.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/how-to-download-minecraft-for-free-on-mac_GM479516143.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/static-moonactive-net-free-spins-coin-master_GM406889139.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/robux-free-deniz_GM431946152.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/dlls-for-roblox-hacks_GM431946152.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/maxim-games-free-robuxcom_GM431946152.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/free-spins-coin-master-november-2021_GM406889139.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/how-to-get-free-clothing-on-roblox-2021_GM431946152.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-app_GM406889139.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/free-limiteds-com-roblox_GM431946152.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/40-free-spins-coin-master_GM406889139.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/my-minecraft-account-was-hacked_GM479516143.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/roblox-hack-that-works-jailbreak_GM431946152.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/coin-master-spin-hack-2021_GM406889139.pdf
    • https://www.elearning.mtsn4jkt.sch.id/__statics/gudangsoal/files/free-roblox-groups-with-funds_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ff8.bin
e3a0cbc8e8d663b0af3c294c5ce8103e55ad95a0f245e2bf8c2f52df0f73ef86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF8 22612 bytes
font_01_sfnt_off00006267.bin
6f7a3771de7e76f6a30eccfe6de97210a9aaee265036d39eb3e49971bc7f02bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6267 18352 bytes

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