Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb89b678d282e73f…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 03:00:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 368c396911099561e20fa92a7031d865 SHA-1: 583917bfb8c5932230e691ba420b5bccbc8ff127 SHA-256: eb89b678d282e73f0308526dcb8c8d185d0473e1974f060ea29b67d270ac6a9f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a known malicious infrastructure, specifically advertising 'free spins for coin master game hack'. The ML classifier also flagged this PDF with high confidence. The document body, though partially corrupted, contains the same lure and URL, indicating a phishing attempt to trick users into visiting a malicious site.

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/406889139/100-free-spins-for-coin-master-game-hack In PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/robux-game_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/how-to-hack-in-roblox-to-rank-up-a-group_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/hack-para-trollear-roblox_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-roblox-website_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-galaxy-shirt-free-shipping_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-roblox-card_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/freerobux-co_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/master-coin-master-free-spin_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
font_00_sfnt_off00003187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3187 23076 bytes
SHA-256: e3b17414419199f8808c32af7a856477df4eaef37c34da7d6f8617d02585c61a
font_01_sfnt_off0000657a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x657A 18452 bytes
SHA-256: cbec87cca7f7cca850beed699eaca371d5fd18686c8cdb34b80e651b1aa3e733

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