Malicious PDF — malware analysis report

Static analysis result for SHA-256 681c9de5397ddc18…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 23:01:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 15c170bf65a15c26d7107338cd0cc473 SHA-1: eecd24cb0bc707d7df0c67b52eca688a4c02beec SHA-256: 681c9de5397ddc18b46346fe0f33b91de63b099d9d0e1ab6ef38156978a9f348
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 related to obtaining free in-game currency or hacks. The ML classifier also flagged this PDF as malicious. The presence of a "download button" heuristic further suggests a deceptive user interaction is intended. The document likely serves as a link farm to direct users to scam or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/free-daily-spins-coin-master-game-hack
    • http://perpustakaan.urindo.ac.id/repository/get-robux-for-free-2021_GM431946152.pdf
    • http://perpustakaan.urindo.ac.id/repository/hack-coin-master-iphone_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/roblox-zone-free-robux_GM431946152.pdf
    • http://perpustakaan.urindo.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • http://perpustakaan.urindo.ac.id/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/free-robux-with-no-human-verification_GM431946152.pdf
    • http://perpustakaan.urindo.ac.id/repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • http://perpustakaan.urindo.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdf
    • https://perpustakaan.urindo.ac.id/repository/tiktok-free-online-textbooks_GM835599320.pdf
    • http://perpustakaan.urindo.ac.id/repository/best-free-spins-for-coin-master_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/coin-master-cheats-2021_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/can-i-play-roblox-for-free_GM431946152.pdf
    • http://perpustakaan.urindo.ac.id/repository/coin-master-free-spins-that-really_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/free-coins-and-spins-coin-master_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/facebook-coin-master-free-spins-link_GM406889139.pdf
    • http://perpustakaan.urindo.ac.id/repository/free-minecraft-mods_GM479516143.pdf
    • https://perpustakaan.urindo.ac.id/repository/how-to-download-tiktok-free_GM835599320.pdf
    • http://perpustakaan.urindo.ac.id/repository/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051fd.bin
d2b2632d2f6472a8a733dc88ba8c66a5a59df93e81a981ad70a62c84221948e8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51FD 24892 bytes
font_01_sfnt_off00008a8e.bin
55eaac4e6bbee5e06de7435d22c867d27a3c8151a397b13177f5239675c95764		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A8E 18308 bytes

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