Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f3a96236d98cff…

MALICIOUS

PDF

35.9 KB Created: 2021-07-07 17:05:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 76682df686fbabfa6db7470a57884549 SHA-1: 54e84999d3aa5905526c3eb5e2233af6b981745d SHA-256: 49f3a96236d98cff285b8b890dc2893eb74f2e42f7c08eb3eed79c1721782578
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a malicious lure, specifically a link farm designed to redirect users to pages offering in-game currency hacks. The presence of numerous external URLs, including one pointing to 'netcdn.tw/app/431946152/how-to-get-free-robux-on-roblox-2021-game-hack', and the PDF_SEO_LINK_FARM heuristic strongly suggest this is an attempt to drive traffic to potentially harmful sites. The ML classifier also flagged this PDF 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.tw/app/431946152/how-to-get-free-robux-on-roblox-2021-game-hack
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/free-robux-games-on-roblox_GM431946152.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/coin-master-2021_GM406889139.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/roblox-hack-deutsch-pc-2021_GM431946152.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/cute-hacks-for-roblox-royal-hjigh_GM431946152.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/free-game-pack-coin-master_GM406889139.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/how-to-hack-a-roblox-account-2021_GM431946152.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/free-robux-no-verification-2021_GM431946152.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/roblox-ro-ghoul-free-yen_GM431946152.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/coin-master-hack-with-facebook-login_GM406889139.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/coin-master-free-spins-2021-link_GM406889139.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/minecraft-hack-download_GM479516143.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/coin-master-hoe-to-get-extra-free-spins_GM406889139.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/free-robux-game-made-by-roblox_GM431946152.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/how-to-change-roblox-username-for-free-2021_GM431946152.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/ac-market-coin-master-hack_GM406889139.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/free-roblox-gear_GM431946152.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/new-cheat-roblox_GM431946152.pdf
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/how-to-get-free-robux-in-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032e6.bin
fe6710d17215a1424a3765e00da56d8c2e81d7390b0febcf14309c1cc0a73658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32E6 22896 bytes
font_01_sfnt_off0000661c.bin
a88a3b37d26ae7f28ec6954540056097f0f8d6b678a801dc09bd2df82b34d325		 pdf-font-stream PDF embedded font (sfnt) at offset 0x661C 19460 bytes

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