Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b066f0c988a331…

MALICIOUS

PDF

226.4 KB Created: 2021-07-04 07:52:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6facfebe4e53bd70d3585948a5ce53d1 SHA-1: fb1015df7d6488b9ac82d56256a7e815a41222ac SHA-256: 93b066f0c988a331e625ef0c858148bbe6c56ddfc9c4efb5d1444cfcf7b458ef
250 Risk Score

Malware Insights

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

The PDF document employs social engineering tactics, presenting a fake CAPTCHA and a "free generator / game hack" lure to trick users into clicking a malicious link. This link, http://netcdn.tw/app/1094591345/pokemon-go-free-spoofing-game-hack, is associated with known malicious redirector infrastructure. The overall pattern suggests an attempt to deliver a secondary payload or redirect the user to a phishing or malware-hosting site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0117

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-spoofing-game-hack In PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/roblox-free-skin_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/unlimited-robux_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/moon-active-games_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-star-codes-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/real-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/google-coin-master-free-spins_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_off00031e02.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31E02 25576 bytes
SHA-256: c3100247ee31fbfb018ff90163bd8f1bf27b57f9538a8f7160b5eccd35c12995
font_01_sfnt_off000359ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x359FF 18656 bytes
SHA-256: dc359485d52a954f2a8b2b7cc7626ed276cf70412c39dcab9fcb0c0fc6259f93

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