Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdd538640d57f15…

MALICIOUS

PDF

50.1 KB Created: 2021-05-12 15:55:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5c2f8debe0ea5e6d247da4d645021c8a SHA-1: 3cb446aa8f5c45fb6a2fc0854d46339fef783357 SHA-256: ccdd538640d57f158e49ed2af1e673c85e611fe413b91598ac54eac4dfdbb712
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful content or facilitate SEO spam. The presence of a download button lure further supports this. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8594

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/479516143/if-you-delete-minecraft-can-you-redownload-it-for-free-game-hack
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/can-u-get-free-robux_GM431946152.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/earn-free-spins-for-coin-master_GM406889139.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-to-get-free-robux-2021-easy_GM431946152.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-robux-android_GM431946152.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-to-get-free-roblox-money_GM431946152.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/como-hackear-coin-master-espaol_GM406889139.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/coin-master-connection-lost-hack_GM406889139.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/buxblast-com-robux_GM431946152.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/coin-master-hack-apk-2021-download_GM406889139.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-to-change-your-name-on-roblox-for-free_GM431946152.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-robux-mod_GM431946152.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/minecraft-pe-server-hosting-free_GM479516143.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/minecraft-build-hacks_GM479516143.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/roblox-free-download_GM431946152.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/coin-master-hack-tips_GM406889139.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/optifine-pe_GM479516143.pdf
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-do-i-get-free-robux_GM431946152.pdf
    • http://www.freenom.comHey
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000517e.bin
35231ea5de12c9946794e0b5f25c953f404f35380bd9ad2381b65b3eba113f94		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x517E 25228 bytes
font_01_sfnt_off00008b83.bin
c52013fc8492b329e8d6afbe90626ea7991afa96217df70f9422b625ad7b37a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B83 3156 bytes
font_02_sfnt_off0000965b.bin
4555740682277f0055d57b15bd0ba953e5b51415ea3d21c93db391eace072d4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x965B 2816 bytes
font_03_sfnt_off0000a06c.bin
18962371c76fb720bd28e976e47cbcb39c5d47198828412c269f5aef32a49cfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA06C 18592 bytes

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