Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e8389a15346e1c…

MALICIOUS

PDF

43.6 KB Created: 2021-05-15 15:07:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 79d3ecf6b33da96dbfb7b78f000b8be6 SHA-1: 3daa46ebced50edb2142fdf54f6dc1b2befc2dcb SHA-256: 19e8389a15346e1c1babc94d21e93503cd6397c6be581de3b6e64d11d6333e0f
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with malicious links. It also features a large number of external links, many of which point to PDF files with SEO-like titles related to game hacks and free currency. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/how-to-hack-a-roblox-account-easy-game-hack
    • http://www.biochemix.com/uploaded_files/userfiles/files/how-to-earn-free-robux_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-coins-coin-master_GM406889139.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/hack-roblox-players_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-robux-com-no-verification_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/coin-master-free-spins-links-2021_GM406889139.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/robux-game-com_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/robux-generator-no-survey_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-robux-no-verification-no-survey_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/minecraft-pe-015-0-apk-free-download_GM479516143.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/cm-spin-link_GM406889139.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/minecraft-launcher-download-free_GM479516143.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/how-to-get-more-spins-on-coin-master_GM406889139.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/free-spin-link-for-coin-master_GM406889139.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdf
    • http://www.biochemix.com/uploaded_files/userfiles/files/hackear-juego-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004af3.bin
a7c4f3e2256deb62f9620f08629577769d37c7ed52a4a239c02cfe2c5ab0903b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF3 26764 bytes
font_01_sfnt_off00008678.bin
f0aa2a8f008262e8aa636f08cdffff7c9568ae6e0bf5f389be1472b9a6879674		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8678 18772 bytes

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