Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb49bae2556f25c…

MALICIOUS

PDF

42.5 KB Created: 2021-05-11 09:17:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cd6e20df1810e8ee1eac92fbc3e03434 SHA-1: 959a6bc7b868f0e373ac87e2096d8aa499258122 SHA-256: cdb49bae2556f25c310994d2fd41c926d3d3f650c1bad0ac54f47314cea43dd7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized and point to game-related exploits and free items, suggesting a link farm or phishing lure. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/roblox-games-to-play-for-free-game-hack
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-spin-free_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac//repository/how-can-you-get-minecraft-for-free_GM479516143.pdf
    • http://elib.upiyptk.ac.id/opac//repository/free-exploits-for-roblox_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac//repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/free-daily-spins-coin-master-2021_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac//repository/free-promo-codes-for-coin-master_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac/repository/can-you-really-hack-coin-master-ios_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac//repository/roblox-avatar-com_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/doctor-louie-roblox_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/hack-coin-master-for-free_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-hack-generator_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-toys-for-free_GM479516143.pdf
    • http://elib.upiyptk.ac.id/opac//repository/get-free-spins-coin-master-2021_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hack-ios-no-human-verification_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac//repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/good-free-minecraft-server-hosting_GM479516143.pdf
    • http://elib.upiyptk.ac.id/opac//repository/free-spins-coin-master-links_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hack-tool-india_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac//repository/roblox-gift-card-online-free_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac//repository/minecraft-windows-10-key-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004773.bin
8f75f128ad2a54e70d2742bc466645f166945d5ec701a559e9606dfc92ea375d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4773 25300 bytes
font_01_sfnt_off00008235.bin
ab23d1b79a91ba718332cf6cb35a2d4f002a60c6040c891a5ecca9d58b4dd5b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8235 18768 bytes

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