Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f9ef4008f7564d…

MALICIOUS

PDF

41.9 KB Created: 2021-05-17 12:08:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f441f66fd68db34fa439eb79be6233c2 SHA-1: 307e387f6df7aa73fe91113cbacf4c606ab6e1d4 SHA-256: f5f9ef4008f7564df7f8b90f9bfbde68a034b8cca98bb903e938786b7062e1f3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are SEO-optimized and point to websites offering game cheats and free in-game currency. The ML classifier also flagged this PDF as malicious. The presence of a download button lure further supports the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/coin-master-hack-online-cheat-game-hack PDF link annotation
    • https://abellamoveis.com.br/ckfinder/userfiles/files/coin-master-fb-free-spins-link_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/coin-master-play-online-free_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/easy-robux-generator_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/robux-website_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/coin-master-free-spins-link-today-new-2021_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
stream_003_off00004b54.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B54 24280 bytes
SHA-256: 0b2dd27a227afb4704d3b0d13d39ee29e05c234c8d6692e946b0899242b7e4f1
font_01_sfnt_off00008274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8274 17956 bytes
SHA-256: 443aed1378757c773e02f5a5987283787609be462fae8ba99418116e4694aa7f

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