Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c6302841e02b33…

MALICIOUS

PDF

46.0 KB Created: 2021-05-15 03:19:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fe854498653d6134ab58536e984a68c4 SHA-1: 64097801e0ba2d59ba01ff6014b0431f184f5547 SHA-256: 37c6302841e02b33d04da8b5b1bbd4275c3a62e65acc84612935d8791f3356f5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits malicious behavior by presenting a fake CAPTCHA or human verification prompt to trick users into downloading content. It contains numerous embedded links, including a primary URL pointing to a game hack download, and a large farm of SEO-optimized PDF links hosted on rafaelmontesinos.com. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/roblox-download-game-hack
    • http://rafaelmontesinos.com/images/how-to-create-group-in-coin-master-free-spins_GM406889139.pdf
    • http://rafaelmontesinos.com/images/roblox-e-free_GM431946152.pdf
    • http://rafaelmontesinos.com/images/how-to-win-free-robux_GM431946152.pdf
    • http://rafaelmontesinos.com/images/coin-master-free-spins-generator-no-human-verification_GM406889139.pdf
    • http://rafaelmontesinos.com/images/coin-master-free-spins-2021_GM406889139.pdf
    • http://rafaelmontesinos.com/images/how-to-get-free-robux-no-verification-2021_GM431946152.pdf
    • http://rafaelmontesinos.com/images/coin-master-apk-hack-2021-ios_GM406889139.pdf
    • http://rafaelmontesinos.com/images/coin-master-hack-no-verify_GM406889139.pdf
    • http://rafaelmontesinos.com/images/get-free-spins-coin-master-2021_GM406889139.pdf
    • http://rafaelmontesinos.com/images/free-coinmaster-spins_GM406889139.pdf
    • http://rafaelmontesinos.com/images/free-robux-with-no-human-verification_GM431946152.pdf
    • http://rafaelmontesinos.com/images/get-free-coins-on-coin-master_GM406889139.pdf
    • http://rafaelmontesinos.com/images/hack-download_GM431946152.pdf
    • http://rafaelmontesinos.com/images/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdf
    • http://rafaelmontesinos.com/images/microsoft-rewards-robux_GM431946152.pdf
    • http://rafaelmontesinos.com/images/how-do-you-get-roblox-for-free_GM431946152.pdf
    • http://rafaelmontesinos.com/images/coin-master-spin-link-2021_GM406889139.pdf
    • http://rafaelmontesinos.com/images/get-free-spins-coin-master_GM406889139.pdf
    • http://rafaelmontesinos.com/images/free-robux-hack-2021_GM431946152.pdf
    • http://rafaelmontesinos.com/images/rape-simulator_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000480e.bin
ed87a2234d293693438cbfe52b821fb48a4c0cc66961e5209bec4a037ba5a656		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x480E 25932 bytes
font_01_sfnt_off0000836c.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x836C 5696 bytes
font_02_sfnt_off0000907d.bin
21b28ace4d932993d49d3193db8b098f0f06cc97e3b5056ef7549ebd787d2b01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x907D 18520 bytes

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