Malicious PDF — malware analysis report

Static analysis result for SHA-256 093c3e9f197b99e4…

MALICIOUS

PDF

45.2 KB Created: 2021-06-09 12:01:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fdddbb8c15a6aa309e2531fffb2cad12 SHA-1: 1311c1e7d46a29f5787f843c715735cd343fb3f4 SHA-256: 093c3e9f197b99e416ae006bd0dc59d199a3592a91455e7b2f41e472d0d1b312
142 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, directing users to sites offering game hacks and free items. The ML classifier strongly flagged this PDF as malicious, and the presence of a password archive lure suggests an attempt to bypass security scanning. The document's content and structure indicate a social engineering tactic to drive users to potentially malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://netcdn.tw/app/431946152/hack-jailbreak-roblox-2021-kranberrye-game-hack
    • https://www.99champions.com/uploaded_files/userfiles/files/free-robux-hack_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/free-robux-without-human-verification-real_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/free-pet-treats-coin-master_GM406889139.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/sites-to-get-free-robux_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/free-coins-coin-master-link-2021_GM406889139.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-april_GM406889139.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/websites-that-give-you-free-robux_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-hackhub-coin-master_GM406889139.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/roblox-robux-generator_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/get-coin-master-free-spin_GM406889139.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master-fan-page-free-spins_GM406889139.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/free-minecraft-thumbnails_GM479516143.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/free-robux-de-com_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/microsoft-free-robux_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/free-coins-app-for-coin-master_GM406889139.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/is-roblox-studio-free_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/google-roblox-games_GM431946152.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/free-coins-on-coin-master_GM406889139.pdf
    • https://www.99champions.com/uploaded_files/userfiles/files/hack-xp-net-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051a5.bin
72baa85e02e8c3e8c030537508d9882102d440a3e96dba90095aa967c66a4a14		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A5 25124 bytes
font_01_sfnt_off00008b99.bin
73c099c8c68bafcaf5be30c7e1781e4a3b64ec9b227a3f1413a5298acb58c074		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B99 19052 bytes

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