Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5446a7b4de6bfd…

MALICIOUS

PDF

226.4 KB Created: 2021-07-04 23:55:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c19149e844aca2e58945ca71bf9fde40 SHA-1: 0c720257dbf805d3b5d3eab40abc621c80605c21 SHA-256: fc5446a7b4de6bfdf54cc2a4f69c93f34a378ecfe45a77f1dbcdd00828914c97
250 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating social engineering lures, including fake CAPTCHAs, payment redirection, and browser extension installation prompts. It also links to known malicious redirector infrastructure, specifically http://netcdn.tw/app/1094591345/pokemon-go-free-coin-promo-code-game-hack, which is presented as a "free generator / game hack". The document body, though heavily obfuscated, contains references to this URL and appears to be designed to trick the user into clicking the link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

Heuristics 7

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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
  • 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
  • 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-coin-promo-code-game-hack In PDF document text
    • http://library.yamasi.ac.id//repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-roblox-expoit-may-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-tips_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-script-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/robux-hack-real-no-survey_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-pc-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-robux-on-windows_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-with-no-survey_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_off00031e30.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31E30 25576 bytes
SHA-256: e971c9189b2c4d9d5ed9fa3a8867803a276cdfa8c9f82b92266c5976da94aa8c
font_01_sfnt_off00035a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35A35 18652 bytes
SHA-256: 6c078fdaf04e566a7ff979b4650af97075457689791c6c92f77cd5c55472f932

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