Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ca8d9fd4d3d72e…

MALICIOUS

PDF

44.6 KB Created: 2021-05-19 01:11:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2b659b4be171fd434eb62ca171d7174b SHA-1: ac95e2d9465525c3b7db76f6c369a1d5d7a47a6a SHA-256: 61ca8d9fd4d3d72e8a51f0d086ccb8edf8e92f4b293bfa4350b7cafadb06d637
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a malicious lure, employing a fake CAPTCHA to trick users into interacting with embedded links. The document contains a large number of external links, many of which point to SEO-optimized PDF files, suggesting a link farm or traffic-driving scheme. The primary external URL identified is https://netcdn.xyz/app/406889139/coin-master-gold-cards-free-link-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/coin-master-gold-cards-free-link-game-hack
    • http://library.stieyapan.ac.id//repository/coin-master-free-spins-links-2021_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/minecraft-games-online-free-no-download_GM479516143.pdf
    • http://library.stieyapan.ac.id//repository/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdf
    • http://library.stieyapan.ac.id//repository/coin-master-free-spin-and-coin-link-app_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/how-to-get-minecraft-for-free-on-phone_GM479516143.pdf
    • http://library.stieyapan.ac.id//repository/hacked-roblox-game_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/minecraft-hack-download_GM479516143.pdf
    • http://library.stieyapan.ac.id//repository/coin-master-hack-apk-iphone_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-root-hack_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/how-to-get-free-followers-on-roblox_GM431946152.pdf
    • http://library.stieyapan.ac.id//repository/roblox-pink-free-robux_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdf
    • http://library.stieyapan.ac.id//repository/blogspot-free-spins-coin-master_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/links-for-free-spins-for-coin-master_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-free-spin-link-new_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/free-coins-coin-master-2021_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/free-roblox-pin-codes_GM431946152.pdf
    • http://library.stieyapan.ac.id//repository/roblox-troll-outfits-free_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a20.bin
bf67681320a837f3fb0346516db0f019d6edfd11b9809a6c2e8a19158c77e151		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A20 25080 bytes
font_01_sfnt_off000082a5.bin
381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A5 2824 bytes
font_02_sfnt_off00008c47.bin
3c7d889e052bb081026c5a88f6ee2afe5bc892e32bf973502febc93f4313d009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C47 18128 bytes

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