Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfa97de23a8f199…

MALICIOUS

PDF

43.7 KB Created: 2021-05-13 11:04:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c3e374c7f1eee0e54d75fd9e8591bc71 SHA-1: bf10afcdb7d5265c6fcd4f33f6f799c754cb282e SHA-256: 6cfa97de23a8f199c84bfec19c47abe7b5b011bd78d97f8803b41409cfd41589
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector link disguised as a game hack generator, aiming to trick users into downloading further content. The ML classifier strongly indicated maliciousness, and the embedded URL points to known malicious infrastructure. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/406889139/free-spins-coin-master-links-2021-game-hack In PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/coin-master-homepage_GM406889139.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/coin-master-link_GM406889139.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://disperkim.samarindakota.go.id/file/images/ckeditor/files/how-to-get-roblox-premium-for-free-2021_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_003_off00004d32.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D32 25524 bytes
SHA-256: bc5729fe7f4426cc23c4202d13bf2e1dcc674981770985b0b9471bc5f3091ba9
font_01_sfnt_off0000882d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x882D 18456 bytes
SHA-256: c809cb62993c96a2792eb05fd7593de41ec7ce02e3f179f2cd9cbcb899f0cf70

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