Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb9f9f798b321ba…

MALICIOUS

PDF

42.7 KB Created: 2021-05-12 18:08:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 73a16416b0c935d96fd5e8ee7c8fbb7e SHA-1: 66ab5fd17963845065f2ca04b85a9b5cc23c4561 SHA-256: 2cb9f9f798b321bab49f3926c90b817fd9448b83111c1d8445a19784d5a045f9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with the document. It also hosts a large number of external links, many of which point to PDF files related to game hacks and cheats, suggesting a scam or malware distribution campaign. The ML classifier also flagged this PDF as malicious with high confidence.

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.
  • 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/hack-game-plus-com-coin-master-game-hack
    • http://stpc.it/images/free-promo-codes-roblox_GM431946152.pdf
    • http://stpc.it/images/roblox-demon_GM431946152.pdf
    • http://stpc.it/images/coin-master-mod-apk-hack_GM406889139.pdf
    • http://stpc.it/images/how-to-get-free-robux-for-free_GM431946152.pdf
    • http://stpc.it/images/how-to-make-robux-on-roblox_GM431946152.pdf
    • http://stpc.it/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdf
    • http://stpc.it/images/coin-master-free-coins-link-2021_GM406889139.pdf
    • http://stpc.it/images/minecraft-dungeons-free-download-pc_GM479516143.pdf
    • http://stpc.it/images/free-robux-codes_GM431946152.pdf
    • http://stpc.it/images/free-minecraft-addons_GM479516143.pdf
    • http://stpc.it/images/coin-master-hack-for-android_GM406889139.pdf
    • http://stpc.it/images/free-gold-cards-for-coin-master_GM406889139.pdf
    • http://stpc.it/images/apps-to-get-free-robux_GM431946152.pdf
    • http://stpc.it/images/free-spin-app-coin-master_GM406889139.pdf
    • http://stpc.it/images/play-coin-master-online-free_GM406889139.pdf
    • http://stpc.it/images/how-to-hack-coin-master-with-game-guardian_GM406889139.pdf
    • http://stpc.it/images/youtube-how-to-get-free-robux_GM431946152.pdf
    • http://stpc.it/images/minecraft-hacks-wurst_GM479516143.pdf
    • http://stpc.it/images/free-spins-on-coin-master-app_GM406889139.pdf
    • http://stpc.it/images/earn-free-robux-for-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b12.bin
f05865c616d651bc18c099698797db0916b23541ab0ca132aa88b629d5f96ccc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B12 25660 bytes
font_01_sfnt_off000084a7.bin
67e0faa45ea1c1ed6f200b64ded63a8801cb37d584db731deacfac1a4f2a4512		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A7 18344 bytes

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