Malicious PDF — malware analysis report

Static analysis result for SHA-256 859528808e25576d…

MALICIOUS

PDF

225.6 KB Created: 2021-07-04 12:25:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9b02bdce6326f63deb370b8c7033b7c5 SHA-1: e81386b217169b53c93ad56fd16f865729f47b93 SHA-256: 859528808e25576dd079a53f5c3bd27157813ef8e47ab18648f412714655bb8d
250 Risk Score

Malware Insights

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

This PDF document employs social engineering by presenting a fake CAPTCHA and a lure for a 'free generator / game hack'. It contains multiple links to known malicious redirectors, including http://netcdn.tw/app/1094591345/pokemon-go-free-game-hack, which likely serves as a gateway to further malicious content or exploits. The document's structure and embedded links suggest an attempt to trick users into executing malicious code or visiting compromised sites.

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-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/where-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-avatar_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/google-moon-active_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-card-collection-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-hax_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/john-doe-roblox-hacker-march-18_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/pubg-4all-cool-20219-uc_GM1330123889.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_off00031bf4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31BF4 25576 bytes
SHA-256: ff8ecf15b7d0dccb6a291d69ac37f5cdcf07ad06524027a1a9f2a28fabf9f97e
font_01_sfnt_off000357f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x357F8 18360 bytes
SHA-256: 3f5f8afbca1afb7d5a7280d0fea0080561aa167918c496b16f0d46ebcd8c98d0

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