Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dfa55d816f947a3…

MALICIOUS

PDF

50.8 KB Created: 2021-06-13 14:53:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1c556d989286367174a5d265f8670a5d SHA-1: 791ae930628d6597ad57004d9a489f2db7895f0a SHA-256: 2dfa55d816f947a3ff09bd391641d3611cad88b29b02c3c98faf71e02609e95e
102 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are SEO-optimized and point to other PDFs, suggesting a link farm designed to distribute malicious content. The presence of a download button lure further supports the malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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/roblox-201-exploit-free-lvl7-game-hack
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/how-to-get-100-robux-for-free_GM431946152.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/free-spin-link-in-coin-master-game_GM406889139.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/how-to-get-free-minecraft-skins_GM479516143.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/free-minecraft-printables_GM479516143.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/free-promo-codes-roblox-june-2021_GM431946152.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/pokemon-go-free-808_GM1094591345.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/free-shirt-templates-roblox_GM431946152.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/grab-points-login_GM431946152.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/gameoffice-net-hack-coin-master_GM406889139.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/roblox-hacks-through-walls-on-jailbreak_GM431946152.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/free-spins-coins-coin-master_GM406889139.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/free-coins-coin-master-hack_GM406889139.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/minecraft-windows-10-hacked-client_GM479516143.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/claim-free-spins-coin-master_GM406889139.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/free-coins-and-spins-coin-master_GM406889139.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdf
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/coin-master-hacked-apk-download-for-android_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000543f.bin
bb6c48bcc1c2d9d999d5bb6ae895676111af7c60d4d771d0e3450eeffc04d12f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x543F 27456 bytes
font_01_sfnt_off00009504.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9504 5696 bytes
font_02_sfnt_off0000a215.bin
45098c56a2226111c9b4e1b6a89c2fdb4aca45fc4757c619eaeb0518705c87f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA215 18920 bytes

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