Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cbc76bd5688c0b…

MALICIOUS

PDF

35.4 KB Created: 2021-06-18 14:08:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3d907637b828ea40b4f3b0a704600876 SHA-1: e79037aa97bb5192408ca89e2549c9977fabd778 SHA-256: 18cbc76bd5688c0bc3745438ac6dc499dc71813136299b1ec0e3049a3a9296cb
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a document body that promotes game hacks and free in-game currency, such as 'robux'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ML classifier strongly flagged the document as malicious. The primary IOC is the URL http://netcdn.co/app/431946152/hack-somebody-on-roblox-game-hack, which is likely the destination for the malicious lure.

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/hack-somebody-on-roblox-game-hack
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/hacks-for-roblox-prison-life_GM431946152.pdf
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/robux-maniac-free-robux-on-web-site_GM431946152.pdf
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/info-roblox-com-robux_GM431946152.pdf
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/free-robux-no-verify_GM431946152.pdf
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdf
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/coin-master-hack-game-download-ios_GM406889139.pdf
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/free-robux-hack-forum-by-envix_GM431946152.pdf
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/coin-master-mod-apk-free-download-for-android_GM406889139.pdf
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/free-robux-by-watching-ads_GM431946152.pdf
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/is-it-possible-to-get-free-robux_GM431946152.pdf
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/free-tiktok-followers-no-downloads_GM835599320.pdf
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/minecraft-rtx-download-free_GM479516143.pdf
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/free-robux-no-offers_GM431946152.pdf
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/coin-master-free-coins-facebook_GM406889139.pdf
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/hack-roblox-account-passwords_GM431946152.pdf
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-instagram_GM406889139.pdf
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/how-to-get-free-unlimited-robux_GM431946152.pdf
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/rbxfree-com-free-robux_GM431946152.pdf
    • https://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/free-roblox-hair-to-wear_GM431946152.pdf
    • http://elearning.hidayatussalam.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000320d.bin
ca6876de73b50fdb3ca6fbc49e6745377865adc7c8fb0786717154b4854d8e6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x320D 22648 bytes
font_01_sfnt_off00006486.bin
ded2bba978f0d660f45cfa03820283a0d0b63d31b96fec3698d5e9c27ab00d8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6486 19268 bytes

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