Malicious PDF — malware analysis report

Static analysis result for SHA-256 b544ef5e3aed61be…

MALICIOUS

PDF

34.8 KB Created: 2021-06-23 02:50:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bccdb59581d0bb7269eac22bb6bd998d SHA-1: 6ac411805149db672eb3cbc120ab63ebf11cc6c0 SHA-256: b544ef5e3aed61be5337628105e8de298218ffcc84bc2525f7d9230abc781dcd
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a 'link farm' structure, strongly suggesting a phishing or scam attempt. The document body and extracted URLs explicitly mention 'free Robux' and game hacks, indicating a lure to trick users into visiting malicious sites. The presence of a PDF_URI heuristic firing on 'http://netcdn.co/app/431946152/free-robux-microsoft-game-hack' further supports this, as it likely leads to a second-stage download or exploit.

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-robux-microsoft-game-hack
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/can-i-get-free-robux_GM431946152.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/roblox-2021_GM431946152.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/haktuts-2021-coin-master-free-spin-link_GM406889139.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/how-to-hack-someone-on-roblox_GM431946152.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/how-to-hack-a-roblox-account-with-editthiscookie_GM431946152.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/games-like-minecraft-but-free_GM479516143.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/free-spin-link-coin-master_GM406889139.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/coin-master-claim-free-spins_GM406889139.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/2021-free-spins-coin-master_GM406889139.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/free-bobux_GM431946152.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/hack-coin-master-1_GM406889139.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/play-minecraft-for-free_GM479516143.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/oprewards-points-generator_GM431946152.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/actual-free-robux_GM431946152.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/how-to-hack-coin-master-using-es-file_GM406889139.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/heroes-online-roblox_GM431946152.pdf
    • https://www.boneyhayschool.co.uk/admin/ckfinder/userfiles/files/robux-earning-websites_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030ec.bin
641b84bd6ab8341ab2aea14b65835c8d0a34c96a7050353371bfe20fd175da10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30EC 22328 bytes
font_01_sfnt_off000062ee.bin
6405807597aca73567740711097b1a0abf87aa815f4236fbfdcb073f0355892d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62EE 19136 bytes

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