Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86e836f50928ec6…

MALICIOUS

PDF

45.8 KB Created: 2021-06-07 09:23:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0cbf5d524682e4c9d60157d5c3f42c44 SHA-1: dd87a52a5091730c0d1b4798b8e3dc034b5835f2 SHA-256: d86e836f50928ec69a5c0ad1cbd140c2cd48cce65bb298731de1329c0a4cc356
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external PDF files, a technique often used for SEO spam or to redirect users to malicious content. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of such links, and the 'ML_NYX_PDF_MALICIOUS' classifier strongly suggests malicious intent. The document body contains garbled text but includes a URL that aligns with the detected link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/roblox-geld-cheaten-game-hack
    • http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/coin-master-links-free-spins_GM406889139.pdf
    • http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-download_GM406889139.pdf
    • https://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdf
    • http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/coin-master_GM406889139.pdf
    • https://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/100-free-spins-for-coin-master-2021_GM406889139.pdf
    • http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/how-to-get-800-robux-for-free_GM431946152.pdf
    • http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/how-to-get-free-roebucks-in-roblox_GM431946152.pdf
    • http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/daily-free-spins-and-coins-coin-master_GM406889139.pdf
    • http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/pubg-uc-lucky-spin_GM1330123889.pdf
    • http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/coin-master-hack-app-2021-download_GM406889139.pdf
    • http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/coin-master-pc-game-free-download_GM406889139.pdf
    • https://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/free-robux-by-watching-ads_GM431946152.pdf
    • http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/earn-robux-by-watching-ads_GM431946152.pdf
    • http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/get-free-robux-no-verification_GM431946152.pdf
    • http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/www-free-robux-com_GM431946152.pdf
    • https://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/how-to-host-a-minecraft-server-for-free_GM479516143.pdf
    • http://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/free-roblox-gift-card-codes_GM431946152.pdf
    • https://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-game_GM406889139.pdf
    • https://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/how-to-get-free-coins-on-tiktok_GM835599320.pdf
    • https://elearning.mtsn1bandung.sch.id/__statics/gudangsoal/files/free-spins-in-coin-master-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054b4.bin
577d26c6cb2d42c6735e0ce843c81786e25ce25c9cc3f760d6cf8f4ea907f9d2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54B4 25460 bytes
font_01_sfnt_off00009001.bin
aebac2b07f38ff0c40db750feeef8db55235de40a5d8ab5df0b249945f9d2c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9001 18456 bytes

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