Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf9879fae11198e…

MALICIOUS

PDF

48.4 KB Created: 2021-06-03 07:22:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: aa3090f25ec8ffa19d5e82f1fbe9bc43 SHA-1: e37e440596c161c32e00073e422aff9700d15f98 SHA-256: cdf9879fae11198ed7987e8ccc4a8a2c5f58d9d1dcf14be278e4a3c527807a11
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links and a document body that promotes game-related cheats and free currency, strongly suggesting a lure to malicious websites. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, and the ML_NYX_PDF_MALICIOUS score is high, confirming the suspicious nature of the document. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/431946152/why-wont-cheat-engine-work-on-roblox-game-hack
    • http://libnh.stikesnh.ac.id/repository/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/free-spins-for-coin-master-hack_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/how-to-hack-coins-in-mcpe-master_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/free-roblox-acc_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/roblox-hack-ga_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/www-cheatsk-com-coin-master-hack_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/games-that-give-you-free-robux_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-without-human-verification_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/how-to-get-coin-master-free-spins-in-email_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/minecraft-java-free-account_GM479516143.pdf
    • http://libnh.stikesnh.ac.id/repository/roblox-how-to-make-clothes-for-free_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/synapse-roblox-free-download_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/free-robux_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/minecraft-skins-download-free_GM479516143.pdf
    • http://libnh.stikesnh.ac.id/repository/how-do-you-get-free-roblox-money_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/free-coin-master-spins-daily_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/free-roblox-accounts-dantdm_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005081.bin
9126d6b7845412d7369858e14092a9b1d08f733087b4be8ee67f60f27faca9fd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5081 26132 bytes
font_01_sfnt_off00008d63.bin
ae8acc7f13e86db3aed98d7dfb73e70e16f4dedb45e9f0467460b76f54e1a1bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D63 2940 bytes
font_02_sfnt_off00009772.bin
eb4beb7f70e985bf37b4d03769eae5489b59e42d361989bcf9b2fca95693da2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9772 19240 bytes

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