Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1d8e9fb844d347…

MALICIOUS

PDF

34.7 KB Created: 2021-07-07 16:28:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 465c0032a4c34c517dc2a3d246f53b70 SHA-1: 7f978e01a8c7e660490d9e3a37f7ad8b448620cf SHA-256: ab1d8e9fb844d34791828bfc991f76f56b32c5e2ab72b5122b5e4cec31f72703
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDF documents related to 'free Robux' or game hacks. The primary URL, http://netcdn.tw/app/431946152/get-free-robux-2021-game-hack, likely hosts the malicious payload. The heuristic PDF_SEO_LINK_FARM indicates a large number of these external links, suggesting a coordinated effort to distribute malicious content. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/get-free-robux-2021-game-hack
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/comment-utiliser-les-cheat-roblox_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/roblox-how-to-get-free-gamepasses-2021_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/get-free-tiktok-followers-no-verification_GM835599320.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/hack-lucky-blocks-roblox_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/roblox-zone-free-robux_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/how-to-get-anything-free-in-the-catalog-roblox_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/roblox-free-robux-scam_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/get-roblox-character-animation-for-free_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/free-robux-and-tix-generator-2021_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/how-to-put-hacks-in-roblox_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/how-to-hack-robux-in-1-min_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/r2d-roblox-hack_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/roblox-shirt-template-download-free-shipping_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/free-roblox-gift-card-codes-2021-november_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/how-to-hack-a-server-in-roblox_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/roblox-gamepasses-for-free_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/a-hack-for-roblox-tower-defence-roblox_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/free-robux-codes-redeem-2021_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku/repository/dowload-free-hair-roblox_GM431946152.pdf
    • http://uptperpustakaan.unismabekasi.ac.id/katalog-buku//repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030ee.bin
e0f0f230bb3fad773406748fa5fcbd9781501fde9866e40ef934bdf13f047903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30EE 22096 bytes
font_01_sfnt_off000061d9.bin
821bcaeb5baca65cbb25255ca6205972482cf4d6c0082e9a42268983cc7c06a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D9 19224 bytes

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