Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e3b6493f23fd61…

MALICIOUS

PDF

42.4 KB Created: 2021-05-17 14:49:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1b0b41d55de589f637c8ae6fc1d6ba3e SHA-1: e7b323e6b8ae579f9197cb303fccdccd0a5767a0 SHA-256: 78e3b6493f23fd613dc667140cfa646f1f1463b15049e60b7fef853d7fad9399
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with malicious links. It also features algorithmically generated URLs pointing to sites offering 'free spins' and 'cheats' for games like Coin Master and Roblox, suggesting a scam or phishing attempt. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of harmful intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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-cheats-free-game-hack
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/minecraft-xbox-one-free_GM479516143.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/my-roblox-account-was-hacked_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/how-to-get-free-shirts-on-roblox_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-robux-codes_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-links-free-spins_GM406889139.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/best-hack-for-coin-master-2021_GM406889139.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/earn-robux-today_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-free-food_GM406889139.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-hacks-for-coin-master_GM406889139.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-coin-master-cards_GM406889139.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-coinmaster-spins_GM406889139.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-daily-spin-coin-master-game_GM406889139.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/spin-link-coin-master_GM406889139.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/roblox-studio-free-robux_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/coin-master-free-box_GM406889139.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdf
    • https://www.letapbiosolutions.com/uploaded_files/userfiles/files/spin-free-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d3c.bin
f7cc06bfe8b6df7d82cd2d656c67451f55b48d2460d2e0fc0516dbaa2dcdc284		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D3C 24672 bytes
font_01_sfnt_off000084ab.bin
3080be39145a7e19e49f31c27d216b7ef11c5a53cf2903de633486ff32396878		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84AB 17876 bytes

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