Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b53f6d2ff4633ef…

MALICIOUS

PDF

54.7 KB Created: 2021-05-19 00:02:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0df37c558716a06f15f50aa965731d36 SHA-1: 053aaf256aafa5f723e12bfa3252141830a5178c SHA-256: 5b53f6d2ff4633ef0a619faab8ed307502c068c9a7aadb5968366f5a2c275d02
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a malicious lure, presenting a fake CAPTCHA to trick users into interacting with embedded links. The document contains a large number of external links, many of which are related to game hacks and cheats, suggesting a phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious, increasing confidence in its harmful intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8531

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-tips-game-hack
    • http://islandhopper.com.au/images/ways-to-get-free-robux-2021_GM431946152.pdf
    • http://islandhopper.com.au/images/hackear-coin-master-sin-verificacion_GM406889139.pdf
    • http://islandhopper.com.au/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • http://islandhopper.com.au/images/how-to-hack-coin-master-apkmody_GM406889139.pdf
    • http://islandhopper.com.au/images/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdf
    • http://islandhopper.com.au/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdf
    • http://islandhopper.com.au/images/how-to-get-free-robux-2021_GM431946152.pdf
    • http://islandhopper.com.au/images/coin-master-hack-unlimited-spins_GM406889139.pdf
    • http://islandhopper.com.au/images/coin-master-free-spins-today-39_GM406889139.pdf
    • http://islandhopper.com.au/images/get-minecraft-windows-10-free_GM479516143.pdf
    • http://islandhopper.com.au/images/can-you-actually-get-free-robux_GM431946152.pdf
    • http://islandhopper.com.au/images/robux-hack-generator_GM431946152.pdf
    • http://islandhopper.com.au/images/minecraft-pocket-edition-free-apk_GM479516143.pdf
    • http://islandhopper.com.au/images/coinmaster-rewards_GM406889139.pdf
    • http://islandhopper.com.au/images/free-robux-place_GM431946152.pdf
    • http://islandhopper.com.au/images/coin-master-hack-lost-world-2021-com_GM406889139.pdf
    • http://islandhopper.com.au/images/how-can-i-get-free-coinsn-coin-master_GM406889139.pdf
    • http://islandhopper.com.au/images/www-coin-master-hack-tk_GM406889139.pdf
    • http://islandhopper.com.au/images/get-free-robux-no-verification_GM431946152.pdf
    • http://islandhopper.com.au/images/robuxy-com-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a51.bin
6e45743e85f2467e57a5f1d42650e780df1273005bfefceaa4a987ffefa25188		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A51 26464 bytes
font_01_sfnt_off0000887c.bin
e7854aff7cbc8fbdeb85d2b3d6248d12dc820ede8a581f4eac107fa6446c2222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x887C 3088 bytes
font_02_sfnt_off00009347.bin
cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9347 7960 bytes
font_03_sfnt_off0000a66d.bin
47f1771a310bbd424fb5c5011bebf45412061033fc49cda5461d9fa2df00a095		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA66D 17724 bytes
font_04_sfnt_off0000c6d3.bin
fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D3 4272 bytes

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