Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f3b37851a6c10a…

MALICIOUS

PDF

35.2 KB Created: 2021-06-19 20:51:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a894af3c0563ccddb7ef36e621ec3ab6 SHA-1: 780aa57b54207f1641e2353734ac2a9d2c930f15 SHA-256: c9f3b37851a6c10adbb4e7acded23ee35890c0a8b8b5341d2e55d23980ad9850
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and a document body that promotes game hacks and cheats, indicating a lure for users to download potentially malicious files. The PDF_SEO_LINK_FARM heuristic suggests a large number of external links were generated, likely to obscure the malicious intent and distribute the payload across multiple domains. The ML_NYX_PDF_MALICIOUS score further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/406889139/coin-master-hack-online-pc-game-hack PDF link annotation
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/generator-robux_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/robux-gratis_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • https://brooklandsfarmchildren.co.uk/admin/ckfinder/userfiles/files/free-spin-link-for-coin-master_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_002_off00003215.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3215 23564 bytes
SHA-256: bdf9e003406682a2ce63b0eb22548dcbebc4e4f3523374ccf1ee79eb83751f9a
font_01_sfnt_off0000674c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x674C 18232 bytes
SHA-256: 2e126d135fd472f17e04e2c2670c366e67c2359c8a974fc9d6678d50609a09dc

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