Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56f8cb16a7e83a1…

MALICIOUS

PDF

34.6 KB Created: 2021-07-01 07:10:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f6b0c6e81a67b413500a81218619cfa7 SHA-1: fcd97d2caae6289a889f44c4d2089bbeb2f177ee SHA-256: a56f8cb16a7e83a1b2d6e9107f1242180d5ec3e9ffb739588ce3e2574b4f8427
102 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are structured as a link farm for SEO purposes, pointing to sites offering free Robux or game hacks. The ML classifier strongly indicated maliciousness, and the presence of download lures reinforces this assessment. The document likely serves as a lure to redirect users to malicious sites or download potentially unwanted or harmful applications.

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/431946152/free-robux-gard-game-hack
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/1-million-robux-game-pass-free_GM431946152.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/free-coin-master-spins-link-download_GM406889139.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/coin-master-hack-download-android_GM406889139.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/free-robux-rewards_GM431946152.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/roblox-hack-online-roblox-hack-2021_GM431946152.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/coin-master-hack-2021-download_GM406889139.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/minecraft-windows-10-free-with-java_GM479516143.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/free-robux-with-no-human-verification_GM431946152.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/is-minecraft-java-free_GM479516143.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/coin-master-claim-free-spins_GM406889139.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/coin-master-connection-lost_GM406889139.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/free-robux-no-human-verification-or-app-download_GM431946152.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/free-robux-websites-that-actually-work_GM431946152.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/get-free-roblox-robux-generator_GM431946152.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/coin-master-free-spin-link-app_GM406889139.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/free-coin-master-spins-and-coins_GM406889139.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/roblox-hack-com_GM431946152.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/roblox-hacked-have-no-pin-code_GM431946152.pdf
    • http://regattamaritimegroup.com/uploaded_files/userfiles/files/roblox-roblosecurity-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003150.bin
a0f6941df4936ffd0713443144ad898348c2a95417406d7b5641057300f33a35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3150 22184 bytes
font_01_sfnt_off000062c2.bin
c0039d9a62b3e8839c6f13e9bbe0f15fe4a63f35f45ce1f58a830d77a67d84f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C2 18888 bytes

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