Malicious PDF — malware analysis report

Static analysis result for SHA-256 63422a71d283836c…

MALICIOUS

PDF

48.1 KB Created: 2021-06-07 13:37:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 17fb0c3f42ac9b0745d121672d3a81d9 SHA-1: d160c285307af9b03e54619707b5ccf9e801346d SHA-256: 63422a71d283836c21fc05d0915df7accd604fc015d13eda537bb4211e134725
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, suggesting a link farm or redirection scheme. The ML classifier also flagged this document as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.tw/app/431946152/how-to-hack-lola202198-roblox-game-hack
    • http://schoolsupportandbeyond.org/images/minecraft-free-ios_GM479516143.pdf
    • http://schoolsupportandbeyond.org/images/free-tiktok-followers-no-human-verification_GM835599320.pdf
    • http://schoolsupportandbeyond.org/images/free-spins-coin-master-site-wwwquoracom_GM406889139.pdf
    • http://schoolsupportandbeyond.org/images/coin-master-lucky-patcher-hack_GM406889139.pdf
    • http://schoolsupportandbeyond.org/images/how-to-get-minecraft-for-free-ios_GM479516143.pdf
    • http://schoolsupportandbeyond.org/images/free-tiktok-followers-no-verification-or-survey_GM835599320.pdf
    • http://schoolsupportandbeyond.org/images/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdf
    • http://schoolsupportandbeyond.org/images/free-coin-master-spins-daily_GM406889139.pdf
    • http://schoolsupportandbeyond.org/images/roblox-studio-free-robux_GM431946152.pdf
    • http://schoolsupportandbeyond.org/images/free-spins-coin-master-october-13-2021_GM406889139.pdf
    • http://schoolsupportandbeyond.org/images/coin-free-spin_GM406889139.pdf
    • http://schoolsupportandbeyond.org/images/free-spins_GM406889139.pdf
    • http://schoolsupportandbeyond.org/images/hack-coin-master-android-2021_GM406889139.pdf
    • http://schoolsupportandbeyond.org/images/oprewards-free-robux_GM431946152.pdf
    • http://schoolsupportandbeyond.org/images/free-minecraft-accounts-reddit_GM479516143.pdf
    • http://schoolsupportandbeyond.org/images/download-coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://schoolsupportandbeyond.org/images/real-free-robux-codes_GM431946152.pdf
    • http://schoolsupportandbeyond.org/images/how-to-get-free-robux-on-phone_GM431946152.pdf
    • http://schoolsupportandbeyond.org/images/coin-master-game-hunter_GM406889139.pdf
    • http://schoolsupportandbeyond.org/images/free-coin-master-spins-and-coins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052cd.bin
0103f97289820d534c14ab4fe7aa1a4261d7011d04171d8666d093bb7f602283		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52CD 29440 bytes
font_01_sfnt_off000096c9.bin
652114ef739a6613524f6901cb99d795df982736db5e17f8febc53a17948cafc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96C9 19124 bytes

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