Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a13f8363100767…

MALICIOUS

PDF

45.3 KB Created: 2021-05-15 16:22:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 46419a66c6fa0a68c56f9f31e0d3f9eb SHA-1: 20dff1d53d911231bdcafe9eb240d790621565e6 SHA-256: a8a13f83631007673478273f7d0d84280d3b1d61274a7dbe688e769133c65bd6
102 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are related to game cheats and free currency for popular games like Robux and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm designed to drive traffic to potentially malicious or scam-related websites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9551

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/websites-to-get-free-robux-game-hack
    • https://citramandiribor.com/ckfinder/userfiles/files/free-robux-com-no-verification_GM431946152.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/free-spins-link-in-coin-master-2021_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/free-unlimited-coins-for-coin-master_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/real-robux-generator_GM431946152.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/get-free-lives-on-coin-master_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/how-to-hack-coin-master_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/how-to-get-free-robux-generator_GM431946152.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/microsoft-robux_GM431946152.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/free-robux-images_GM431946152.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/roblox-hack-scripts-pastebin_GM431946152.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/robux-free-online_GM431946152.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/roblox-free-hair-girl_GM431946152.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-hack-free-spins_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-hacks_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/minecraft-handbook_GM479516143.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-free-spins-link-2021-app_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-unlimited-spin-link_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-free-link-today_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049b9.bin
cc2badc6d10c3eb6e829e703a43f9ca42e9fbd06ee3da8da750ce0c794821a44		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49B9 24264 bytes
font_01_sfnt_off00008105.bin
8509079b3fea9b1b0bd01b02bc92d1b97fdff7c349d50e480661d5cf104b2f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8105 3704 bytes
font_02_sfnt_off00008ded.bin
6ab9ab31980840835fbaeca164a74f0e8188db39a6ce5c5e4face3e95ba0b523		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DED 18436 bytes

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