Malicious PDF — malware analysis report

Static analysis result for SHA-256 584f6024f2e60677…

MALICIOUS

PDF

42.9 KB Created: 2021-05-16 10:15:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cd39e6ddb9171ad25301bacf8407ed67 SHA-1: 79aaef0f94fc7062cde26455a2cc78b1b30ab923 SHA-256: 584f6024f2e60677033f003b1bb7994e08310d04f5f27dbc977c516bae3b9ebe
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO spam campaign. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure suggest an attempt to redirect users to potentially malicious content or further phishing attempts.

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/406889139/link-for-free-spins-on-coin-master-game-hack
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-robux-no-verify_GM431946152.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/coin-master-free-spin-now_GM406889139.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/coin-master-free-card-link-today_GM406889139.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/roblox-comroblox_GM431946152.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/coin-master-free-spin-and-coin-links_GM406889139.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/blogspot-free-spins-coin-master_GM406889139.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/can-you-get-minecraft-for-free-on-pc_GM479516143.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/minecraft-pocket-edition-free_GM479516143.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/roblox-games-to-play-for-free_GM431946152.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/easy-way-to-get-free-robux_GM431946152.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/best-way-to-hack-coin-master_GM406889139.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/hack-coin-master-pc_GM406889139.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/coin-master-hacks_GM406889139.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-robux-generator-no-verification_GM431946152.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/roblox-rape-hack_GM431946152.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/link-coin-master_GM406889139.pdf
    • http://www.pentathlon.org.tw/data/file/userfiles/files/robuxy-com-generator_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c1e.bin
69ec2b04420bb7e6843660fb3e68c14202f11aadc31367ab83be734623246bd6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C1E 25384 bytes
font_01_sfnt_off00008603.bin
722d781e478cd0d1a4785e673d05427d87221dd2f44d1d4595ffa323240eece4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8603 18056 bytes

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