Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c336230118d0c9…

MALICIOUS

PDF

41.3 KB Created: 2021-05-13 07:42:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d7fa4a3ca43bc2be994bf93143ff6d0f SHA-1: 6b00164471c1f00500275b7989f6ba5ee076bf21 SHA-256: c5c336230118d0c983a22c412de4a4eb89b8f05111221c032bc8a3ae7e099020
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm designed to attract users searching for game cheats or free in-game currency. One of the embedded URLs, https://netcdn.xyz/app/406889139/corn-master-game-hack, is likely a lure for a malicious download. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/corn-master-game-hack
    • http://miperwanida.me/__statics/gudangsoal/files/how-to-get-free-robux-2021-easy_GM431946152.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/coin-master-hack-apk-2021-ios_GM406889139.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/free-robux-easy_GM431946152.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/coin-master-spin-and-coins-free_GM406889139.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/is-roblox-free-on-ps4_GM431946152.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/websites-for-robux_GM431946152.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/free-robux-no-verification-no-download-2021_GM431946152.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/free-modded-minecraft-server-hosting_GM479516143.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/minecraft-tower-defense-2-hacked_GM479516143.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/coin-master-hack-tips_GM406889139.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/how-to-get-free-spins-coin-master_GM406889139.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/legit-coin-master-hack-october-2021_GM406889139.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/free-spin-link-for-coin-master-haktuts_GM406889139.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/free-robux-hack-no-human-verification_GM431946152.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/coin-master-daily-spin-free_GM406889139.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/good-free-minecraft-server-hosting_GM479516143.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/how-to-use-wurst_GM479516143.pdf
    • http://miperwanida.me/__statics/gudangsoal/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004959.bin
b62a1d44cd885de7a77b90589da6c76259105e7eb34b8e0568521e1b61774b0b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4959 24416 bytes
font_01_sfnt_off0000815c.bin
bb7ddfb5eeb119ecc025e94c1b8f2696886702df12a5472958d742496d82a376		 pdf-font-stream PDF embedded font (sfnt) at offset 0x815C 17428 bytes

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