Malicious PDF — malware analysis report

Static analysis result for SHA-256 5286cbd85fad4a75…

MALICIOUS

PDF

45.1 KB Created: 2021-05-16 14:49:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 460e961b92fed9514c7e7bf844c2305c SHA-1: 95e9445794b9ee6fd96b57ab232185edb5e20fc1 SHA-256: 5286cbd85fad4a7519e79396359de0c7ef19a1d4ce9dd861549e63fdf1e95906
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 cheat sites. One prominent URL, https://netcdn.xyz/app/431946152/earn-robux-today-game-hack, is directly embedded in the document body. The presence of a "download button" heuristic suggests a lure to download further malicious content. The ML classifier strongly indicates maliciousness, supporting the conclusion that this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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/earn-robux-today-game-hack
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-hack-roblox-accounts-2021_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-15-free-spin-link-today_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/gamehunters-coin-master_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/how-to-get-free-food-on-coin-master_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-hack-xyz-2021_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-free-coins--spins_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-hack-version-download-2021_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-free-spins-link-june-2021_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-card-collection-in-coin-master_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/25-free-spins-coin-master_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-robux-codes-2021-real_GM431946152.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/coin-master-link-today_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/minecraft-bedrock-server-hosting-free_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-coins-and-spins-in-coin-master_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/windows-10-minecraft-hacks_GM479516143.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/hack-coin-master-free_GM406889139.pdf
    • http://stikomyogyakarta.ac.id/ckfinder/userfiles/files/free-roblox-account-generator_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000494c.bin
3bbb9aac939a7271e9ffdd661d7fa6eb7d689025e11e8a95e4a274f9df8eb321		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x494C 24252 bytes
font_01_sfnt_off00008026.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8026 5696 bytes
font_02_sfnt_off00008d37.bin
50fc1adeb895ae30588f73a493889120d8bf728fc3821c38df9289c33b75de2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D37 18432 bytes

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