Malicious PDF — malware analysis report

Static analysis result for SHA-256 0133f3f761cc592e…

MALICIOUS

PDF

43.4 KB Created: 2021-06-03 10:05:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 639189424f6cb65abf8c6ce7da19e736 SHA-1: 8c853daaf756675e2a99573ab18626977284f288 SHA-256: 0133f3f761cc592ec986ceb67bd73c30b20f32d0d3c1a5cd7da4c1c191a878bd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and free in-game currency, which is a common lure for phishing and malware distribution. The heuristic firings indicate that the PDF links to known malicious redirector infrastructure and is flagged by an ML classifier. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a workflow designed to redirect users to malicious content, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.
  • 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 https://netcdn.online/app/431946152/roblox-hacks-2021-game-hack In PDF document text
    • http://librarysenior.com//repository/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/tiktok-free-to-download_GM835599320.pdfIn PDF document text
    • http://librarysenior.com/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/robux-website_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/pokemon-go-free-coins-2021_GM1094591345.pdfIn PDF document text
    • http://librarysenior.com//repository/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-gift-card-codes_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
font_00_sfnt_off00004df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DF4 24288 bytes
SHA-256: 29316e943fd5b803468c3b2e5de84a7065aaed392b7a4348f726a5a4dad1959b
font_01_sfnt_off0000859c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x859C 18584 bytes
SHA-256: 09e382df304bf090e7d4979f9a4a25aa7e11969d647bdc760e706e621b680adc

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