Malicious PDF — malware analysis report

Static analysis result for SHA-256 28861cc514d02212…

MALICIOUS

PDF

35.3 KB Created: 2021-07-09 19:35:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a28a6147df50d7c8505fcc3f4dcd29a5 SHA-1: e275cd9781ef1b5e8e881cdd868530be53b49ac5 SHA-256: 28861cc514d0221216e9a94609596bac4dd50ecb694cf69fc2c2387d59ef3937
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a document body that promotes 'Free Robux Glitch' and related game hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection mechanism. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern involves luring users to click on these links, likely leading to malware downloads or phishing sites.

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.tw/app/431946152/free-robux-glitch-game-hack
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/coin-master-free-coins-app_GM406889139.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/how-to-become-a-hacker-in-roblox_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/roblox-free-robux-website_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/roblox-gift-card-online-free_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/roblox-robux-and-tix-generator-free-download_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/how-many-levels-are-in-coin-master_GM406889139.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-app_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/roblox-dayz-cheat-engine_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/roblox-jailbreak-hack-fr_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/easiest-way-to-get-free-robux-2021_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/500-free-spins-coin-master_GM406889139.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/actual-free-robux_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-jailbreak_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/roblox-how-to-play-games-for-free_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/roblox-free-summer-codes_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/roblox-for-mac-os-x-free-download_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/free-promo-codes-for-robux_GM431946152.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/coin-master-online-hack-download_GM406889139.pdf
    • https://elearning.man1tapteng.sch.id/__statics/gudangsoal/files/free-roblox-hair-red_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003226.bin
0e30ad5d8402112373d3f7da10122eb15d65788f95cab9832e5faa40307855d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3226 22572 bytes
font_01_sfnt_off000064bd.bin
4a662064efa2bd4954903d0e688b5cea29ffcd4305a5606eea95398cceacf406		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64BD 19180 bytes

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