Malicious PDF — malware analysis report

Static analysis result for SHA-256 558c5b74cdb3c699…

MALICIOUS

PDF

35.6 KB Created: 2021-06-28 04:41:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 53d8d2f2b7b8e04b3d1e5db89c02faf0 SHA-1: 64b76d1908c126395632ecb92410ed55ce5582c9 SHA-256: 558c5b74cdb3c69944a8756beeaecc28f999b166e056dda84b24fc74a9ad17e9
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which are related to game hacks and free in-game currency, suggesting a lure for users to download potentially malicious content. The ML classifier also flagged this PDF with high confidence. The presence of a 'download button' heuristic further supports the malicious intent of directing users to external resources.

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/roblox-free-download-for-windows-8-game-hack
    • http://bidship.co.za/uploaded_files/userfiles/files/coin-master-free-spins-daily-2021_GM406889139.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/how-to-hack-in-roblox-2021-jailbreak-mac-os_GM431946152.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/free-tiktok-followers-no-verification-or-survey_GM835599320.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/hack-roblox-sped_GM431946152.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/shadow-raid-cheats-roblox-notoriety_GM431946152.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/free-robux-no-password-or-email_GM431946152.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/free-coin-master-spins-blog_GM406889139.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/free-roblox-builders-club-2021_GM431946152.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/coin-master-hack-apk-free-download_GM406889139.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/free-spins-coin-master-2021_GM406889139.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/free-spins-on-coin-master-link_GM406889139.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/coin-master-spins_GM406889139.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/roblox-promocodes-hack-pastebin_GM431946152.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/daily-free-spin-and-coin_GM406889139.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/legit-coin-master-hack-without-verification_GM406889139.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/roblox-redeem-codes-free_GM431946152.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/how-to-hack-jailbreak-roblox-money_GM431946152.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/how-to-hack-roblox-and-get-free-robux-2021_GM431946152.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/coin-master-free-spins_GM406889139.pdf
    • http://bidship.co.za/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox-2021-fast_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003021.bin
3cf44bcb6e792b96e91dc5340a9192c39811086addb0e473337e1f7f4498e3db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3021 23072 bytes
font_01_sfnt_off00006432.bin
c7e29d95697055f93d9c87d63c49beb5ac43790124e026ebac48a74fd9d5a77f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6432 19684 bytes

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