Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4fe490b1643b3a…

MALICIOUS

PDF

44.8 KB Created: 2021-06-02 13:53:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bff31e4dcb5000def849c83bb0f88efa SHA-1: c78d7363ecc4a8f8ce8138ae1c2acfc152a323be SHA-256: cc4fe490b1643b3a3c728beae91ebd49a69e9ac665415a903cc5c7ba9fb44ba9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, forming a link farm, with the primary lure being "Easy Free Robux Hack 2021". The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to redirect the user to malicious content. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/431946152/easy-free-robux-hack-2021-game-hack PDF link annotation
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/coin-master-fan-club_GM406889139.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/free-robux-come_GM431946152.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/how-to-hack-coin-master-with-root_GM406889139.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/coin-master-working-hack_GM406889139.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/earn-robux_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_004_off0000517b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x517B 25644 bytes
SHA-256: 50a25b8d9aa4156b1d1dfd22de980842f02bbd626ea2ba36e34cffbda9cd9412
font_01_sfnt_off00008a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A67 18992 bytes
SHA-256: 8e862def409c06c6f810584a43073fdcb36bba7626da8a838ca62b56b14f0053

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