Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4ff8451f163d99…

MALICIOUS

PDF

227.0 KB Created: 2021-07-06 22:03:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8f0a7f041da9879158517fbbc1c8f9b7 SHA-1: c8b5f222e30d56fcd4b455af252bed413fd3af72 SHA-256: 5f4ff8451f163d99c104a6ffa156bbf8cd5825c5293cc00cbe5b4642708841f5
250 Risk Score

Malware Insights

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

The PDF document employs social engineering tactics, presenting a fake CAPTCHA and a lure for a game hack generator to trick users into clicking a link. This link, http://netcdn.tw/app/1094591345/pokemon-go-free-zoom-game-hack, redirects to known malicious infrastructure. The document's structure and embedded links suggest an attempt to exploit user curiosity for malicious redirection, likely leading to further malware download or phishing.

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-zoom-game-hack In PDF document text
    • https://www.sonestad.se/library/repository/roblox-com-r_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-builders-club-roblox-trial_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-roblox-cards-pin-number-2021_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/monttechscom-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/where-can-i-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-robux-net_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/roblox-watermelon-shark-for-free_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/25-free-spins-coin-master_GM406889139.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_off0003210d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3210D 25576 bytes
SHA-256: 85bc23c6656714e738b8091a5319452fc8cbc1dfb53877892dab251b662f92f8
font_01_sfnt_off00035d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35D12 18452 bytes
SHA-256: fa7e82bf4d2d9d9f31bfb93c172d68aee85d72b25d3f929f566e7c1915b9023b

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