Malicious PDF — malware analysis report

Static analysis result for SHA-256 547fc655e5a78d96…

MALICIOUS

PDF

42.7 KB Created: 2021-05-13 03:07:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ee834dec08458b02c32b0cf04713fd7c SHA-1: 1c6aac2fd85e57fa18a13f49cb1c99283b814d50 SHA-256: 547fc655e5a78d96ba689fd69244efe0d870391ca21137e4926ec18d15abcf7d
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified as a 'PDF link farm', suggesting a tactic for SEO manipulation or distributing malicious content. The document body, though partially corrupted, contains a URL that aligns with the link farm heuristic. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/free-spin-link-for-coin-master-game-game-hack
    • http://perpustakaan.dutadharma.ac.id/repository/7-year-old-roblox_GM431946152.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/best-hack-for-coin-master-2021_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/rbxfree-com-free-robux_GM431946152.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/can-i-get-minecraft-windows-10-for-free_GM479516143.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/stock-speed-coin-master-free-spins_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-daily-free-spins-today_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-hack-2021_GM431946152.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-spins-hack-without-human-verification_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-discord-servers_GM431946152.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/free-coins-coin-master_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-hack-spins-android_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/free-coins-and-spins-in-coin-master_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-hack-tool-for-pc_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-codes-2021_GM431946152.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-earn-free-robux_GM431946152.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-spin-best-link_GM406889139.pdf
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b72.bin
772953e5903dce902e8b0371fadfcb54d358ffc5ae9452de179f3190cfd20e6d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B72 25040 bytes
font_01_sfnt_off0000848c.bin
4ad106dc66915d7a7c54c506e35e2e74cb7406920644c521a55874c4c44ea7c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x848C 18316 bytes

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