Malicious PDF — malware analysis report

Static analysis result for SHA-256 664226ce2bf6b021…

MALICIOUS

PDF

36.4 KB Created: 2021-07-07 18:35:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ff710715b5ed24add1b1db9f573df2ad SHA-1: d1d881084b35b8f163c30a8d584f3d76ccc2f1cf SHA-256: 664226ce2bf6b0215a8b11875379d3cd610c5fda181032a4c3d8dab363302b16
160 Risk Score

Malware Insights

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

The PDF contains links that redirect to known malicious infrastructure, masquerading as game hacks and generators. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit users into visiting malicious sites, likely leading to further compromise or malware download.

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/coin-master-hacks-2021-game-hack In PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/pubg-uc-id_GM1330123889.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-menu-hack_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/tix-factory-tycoon-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/earn-robux-today_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-rules_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/robux-unlimited-hack_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-free-robux_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-hack-in-roblox-ninja-legends_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
stream_002_off000035ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35AD 23588 bytes
SHA-256: 8bba4a31be11eba243daf1f0f927848bb55be378f026ddcbcea9c7d6cb450630
font_01_sfnt_off00006b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1A 18408 bytes
SHA-256: 8438728008f6ab05b5c9a65d4eeb1f2e5c23a436eadc11c6e76328f72b7d7fb7

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