Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb6cf3dc5de0041…

MALICIOUS

PDF

35.6 KB Created: 2021-07-03 21:00:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9f1da8b389b9a43f6672e7477af72cb1 SHA-1: 6bd6bc838eaeb08986000aac2ff80a3e6d9c701b SHA-256: cdb6cf3dc5de004133fbe32d759d949b7d677a7dfcaa852bfb6b5befdb40619f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary malicious URL identified is http://netcdn.tw/app/479516143/is-minecraft-education-edition-free-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or social engineering attack aimed at tricking users into visiting malicious sites, likely to download further malware or engage in scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/is-minecraft-education-edition-free-game-hack In PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/coin-master-70-spin-link_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/how-to-download-roblox-hack-v65_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/roblox-free-robux-no-download-or-survey_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/2021-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stiks-tarakanita.ac.id/repository/how-long-shold-the-account-stealing-hack-on-roblox-last_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_off00003620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3620 22696 bytes
SHA-256: d5caeefe3254fbe0057cc472980c8e81332374eb2e4683b8481d0af2af98241b
font_01_sfnt_off00006870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6870 18312 bytes
SHA-256: eecac33872f4bf99db25d0145d9acf2ab6d7270ffb9fefd56cdfeedcf9aa8f6d

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