Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f631ebbeb3665c9…

MALICIOUS

PDF

49.2 KB Created: 2021-05-16 22:32:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 758de18a4ba13e6e73c321d20bc23288 SHA-1: fb8fee7d4c740ce34b2e25b88a94d6b8d614059d SHA-256: 1f631ebbeb3665c9e953819f07a6b556b59c507d5471d63a6e90da9a711eba4b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document 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 lure users. One prominent URL, https://netcdn.xyz/app/431946152/synapse-roblox-free-download-game-hack, is directly embedded and likely leads to a malicious download. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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/431946152/synapse-roblox-free-download-game-hack
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/plug-toolbox-for-minecraft-free-ios_GM479516143.pdf
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/minecraft-cheats-switch_GM479516143.pdf
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/get-robux_GM431946152.pdf
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/best-site-for-free-coin-master-free-spin-link_GM406889139.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/coin-master-free-spin-link-twitter_GM406889139.pdf
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/claim-free-spins-coin-master_GM406889139.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/pig-master-free-coins-and-spins_GM406889139.pdf
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/descargar-coin-master-hack_GM406889139.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/hack-coin-master-without-human-verification_GM406889139.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/roblox-generator-no-human-verification_GM431946152.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/hacking-apps-for-roblox_GM431946152.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/coin-master-facebook-hack_GM406889139.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/today-free-spin-link-for-coin-master_GM406889139.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/free-robux-gen_GM431946152.pdf
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/free-roblox-gift-card-codes_GM431946152.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/www-coinmaster_GM406889139.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/minecraft-dungeons-download-free_GM479516143.pdf
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/links-to-get-free-coins-in-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ddb.bin
be0e47fb9ccaeaf39b1652c4c5fb6429061058285dfb31e47fe6aac5c81a6915		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DDB 26260 bytes
font_01_sfnt_off00008b84.bin
62075f0fe13502d46afb6e55e83d440c29ef4988399537df1f86e7653ce3b744		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B84 6636 bytes
font_02_sfnt_off00009b91.bin
893248d405b3cd6ab4cc16169dbaa725a15df4f046ef9721aa1aaf04f233e0f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B91 19036 bytes

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