Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b3bca875da8b85…

MALICIOUS

PDF

41.9 KB Created: 2021-05-13 18:02:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5eaef8ecb46e763befe0ef6771445652 SHA-1: a467f9b05aedb29c125d400f43182fc9edc52199 SHA-256: c3b3bca875da8b858e18f40f2e0b132d1fdca07073398c9d0c451988578fa234
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which are related to game cheats and free currency, indicating a link farm or phishing attempt. The ML classifier also flagged this PDF as malicious. The presence of embedded URIs and the document's structure suggest it's designed to direct users to potentially harmful websites.

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/links-for-free-spins-for-coin-master-game-hack
    • https://elibrary.sttar.ac.id/repository/mine-minecraft-games-for-free_GM479516143.pdf
    • https://elibrary.sttar.ac.id/repository/get-free-robux-info_GM431946152.pdf
    • https://elibrary.sttar.ac.id/repository/free-robux-gift-card-codes_GM431946152.pdf
    • https://elibrary.sttar.ac.id/repository/coin-master-hack-tool-access-online-generator_GM406889139.pdf
    • https://elibrary.sttar.ac.id/repository/free-robux-com_GM431946152.pdf
    • https://elibrary.sttar.ac.id/repository/roblox-land-free-robux_GM431946152.pdf
    • https://elibrary.sttar.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • https://elibrary.sttar.ac.id/repository/how-to-win-free-robux_GM431946152.pdf
    • https://elibrary.sttar.ac.id/repository/best-free-roblox-executor_GM431946152.pdf
    • https://elibrary.sttar.ac.id/repository/free-robux-2021-no-verification_GM431946152.pdf
    • https://elibrary.sttar.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdf
    • https://elibrary.sttar.ac.id/repository/free-spins-on-coin-masters_GM406889139.pdf
    • https://elibrary.sttar.ac.id/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdf
    • https://elibrary.sttar.ac.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • https://elibrary.sttar.ac.id/repository/download-coin-master-apk-hack_GM406889139.pdf
    • https://elibrary.sttar.ac.id/repository/free-spins-for-coin-master-hack_GM406889139.pdf
    • https://elibrary.sttar.ac.id/repository/coin-master-free-spins-app_GM406889139.pdf
    • https://elibrary.sttar.ac.id/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdf
    • https://elibrary.sttar.ac.id/repository/blogspot-coin-master-spins_GM406889139.pdf
    • https://elibrary.sttar.ac.id/repository/how-many-levels-are-there-in-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004920.bin
dacaf2c98c1af4ade170f27cee2b77541378b74f762128ac81cf955a0b29cad1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4920 24716 bytes
font_01_sfnt_off00008205.bin
09cd9e464d76e3a3385f879857787e36dec082617c88c9984b9580abc08ffa43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8205 18056 bytes

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