Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c535d4e95ce99f4…

MALICIOUS

PDF

226.9 KB Created: 2021-07-04 11:01:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e9c67d56da547901c1237ab88c1d6937 SHA-1: 189f7c3d7c864cbc0617f97136dbd764fbf3558b SHA-256: 8c535d4e95ce99f4a673dee8e428f706eea94f1da127dc1baa6d7be12f85a3d4
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious. It uses a fake browser/software-install lure and a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

Heuristics 7

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://netcdn.tw/app/1094591345/pokemon-go-free-online-game-hack PDF link annotation
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/yahoo-games-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-free-robux-without-robot-verification_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-colouring-drawings-of-roblox-characters_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-unused-roblox-cards-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/se-puede-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-a-free-domino-crown-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-inspect-and-hack-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/when-you-you-download-roblox-is-it-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/comment-cheater-sur-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_023_off0003209e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3209E 25576 bytes
SHA-256: 40ddd25ad40bce676463efcd68cce555c1671e2fd5d53ac160d0955ae28a9ddf
font_01_sfnt_off00035ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35CA1 18552 bytes
SHA-256: 784ae84971a068db24c20489966a4b37c84bfa73cd3edacda651267fe835a29d

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