Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca8bab7e25fcc54…

MALICIOUS

PDF

35.0 KB Created: 2021-06-26 03:50:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ffdaa519c7ea12fe4921aa3c48e409e4 SHA-1: 2a50a44ebf263af5d42a9995419638c313feed1d SHA-256: 8ca8bab7e25fcc54996d945363cef31a6607d739503710332a4bdd3e5dbe3ff9
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a call-to-action phrase, strongly suggesting a lure to external malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, likely for SEO manipulation or to host phishing/malware download pages. The ML classifier also flagged this PDF as malicious with high confidence.

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/free-skin-codes-roblox-game-hack
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/coin-master-game-2021-free-spin-link_GM406889139.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/how-to-become-a-hacker-in-roblox_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-robux-site_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/robloxcom-free-kkk-k-k_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-instagram_GM406889139.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-100-robux_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/roblox-hack-2021_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021-link_GM406889139.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/buy-robux-free_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/roblox-free-accessories_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/how-to-earn-robux-by-playing-games_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/minecraft-apk-free-download_GM479516143.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-robux-generator-without-human-verification_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/get-free-robux-no-download_GM431946152.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/free-minecraft-shaders_GM479516143.pdf
    • https://e-learning.manurulhuda-csp.sch.id/__statics/gudangsoal/files/minecraft-for-laptop-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000321b.bin
c7e59c07fa5eee7f71cee6d2afa65c367b6fd8558b66a950995db9899ad4653a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x321B 22332 bytes
font_01_sfnt_off000063b7.bin
6053f7473f3f95ac0dbb17383146cf420f379277a295a3ef45a0c63918cfddad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B7 19112 bytes

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