Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef799db0413fad0b…

MALICIOUS

PDF

44.0 KB Created: 2021-05-15 08:34:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9cff3b0e100b77dfb500a9849f1be901 SHA-1: af25dccd1483f66f4eff4a605374626d210d1726 SHA-256: ef799db0413fad0be64dd8954db61f8f1f5ae8d034df5aa935b7710c369dadda
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, identified as a link farm, suggesting a tactic to drive traffic to potentially malicious sites or SEO spam. The ML classifier also flagged this PDF as malicious. The presence of a 'download button' lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/how-to-hack-roblox-jailbreak-game-hack
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/coin-master-attack-hack-apk_GM406889139.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/get-free-robux-without-doing-anything_GM431946152.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/http-bitly-coin-master-free-2021-spins_GM406889139.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-hack_GM431946152.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/free-private-minecraft-server_GM479516143.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/free-links-to-coin-master_GM406889139.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/free-game-pack-coin-master_GM406889139.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/moonactive-coin-master-free-spins-link_GM406889139.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/roblox-free-executor_GM431946152.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/can-i-get-robux-for-free_GM431946152.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/rbxoffer-com-free-robux_GM431946152.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-haktuts_GM406889139.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/free-games-like-coin-master_GM406889139.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/coin-master-free-blogspot_GM406889139.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/free-robux-no-apps_GM431946152.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master_GM406889139.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/earn-free-robux-on-roblox_GM431946152.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/coin-master-free-spin-and-trading_GM406889139.pdf
    • https://elearning.mtsn3kebumen.sch.id/__statics/gudangsoal/files/minecraft-free-download-laptop_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b07.bin
85bff0f3c67696de1db36325452734c3ef3c2276f17ecbaa2c0036351ee0d946		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B07 27124 bytes
font_01_sfnt_off0000888a.bin
f85879c678901057cc908d94130b71f9fb6e8ee5be1c9db29d303049c5d159a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x888A 18632 bytes

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