Malicious PDF — malware analysis report

Static analysis result for SHA-256 3998288dcdbc94b5…

MALICIOUS

PDF

42.0 KB Created: 2021-05-14 06:06:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f093653a6ef18405bec7d0d74642c7f8 SHA-1: f875154e09273c1c5af3414607b40ffc2a1bfa6d SHA-256: 3998288dcdbc94b53d4400a3ee2dd33f651e7dbcf34a118d1c63642fff07c9e8
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a fake CAPTCHA lure, indicating an attempt to trick users into downloading malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple SEO-linked URLs suggests a link farm designed to distribute malware. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a downloader or redirector.

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/hacks-master-coin-game-hack
    • http://technologicalsc.com/images/hack-coin-master-app-ios_GM406889139.pdf
    • http://technologicalsc.com/images/coin-master-free-spins-ios_GM406889139.pdf
    • http://technologicalsc.com/images/free-robux-generator_GM431946152.pdf
    • http://technologicalsc.com/images/free-coins-and-spins-coin-master_GM406889139.pdf
    • http://technologicalsc.com/images/moonactive-coin-master-free-spins_GM406889139.pdf
    • http://technologicalsc.com/images/robux-redeem_GM431946152.pdf
    • http://technologicalsc.com/images/websites-to-get-free-robux_GM431946152.pdf
    • http://technologicalsc.com/images/earn-free-robux-for-roblox_GM431946152.pdf
    • http://technologicalsc.com/images/how-do-u-get-free-robux-2021_GM431946152.pdf
    • http://technologicalsc.com/images/how-to-get-free-robux-2021_GM431946152.pdf
    • http://technologicalsc.com/images/earn-free-robux-on-roblox_GM431946152.pdf
    • http://technologicalsc.com/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdf
    • http://technologicalsc.com/images/how-to-get-free-roblox-money_GM431946152.pdf
    • http://technologicalsc.com/images/roblox-hack-unlimited-robux_GM431946152.pdf
    • http://technologicalsc.com/images/bux-free-robux_GM431946152.pdf
    • http://technologicalsc.com/images/free-coins-and-free-spins-coin-master-2021_GM406889139.pdf
    • http://technologicalsc.com/images/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • http://technologicalsc.com/images/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • http://technologicalsc.com/images/free-spins-on-coin-master-hack_GM406889139.pdf
    • http://technologicalsc.com/images/free-robux-instantly_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000489a.bin
49f1abc513c8400135d1355512552a0529823d367162c513e09c0cd2263b2082		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x489A 25664 bytes
font_01_sfnt_off00008377.bin
aea1ef4c1cd469d79511e585102869a057304cba4fed84ae86aa90ce3b018750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8377 17716 bytes

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