Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72df097c5c911e2…

MALICIOUS

PDF

35.0 KB Created: 2021-06-22 10:43:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: eeb98ff01fe3a0ad192008515b101f53 SHA-1: 4932f714d158b8b52dc5560c901bb6b3c54c7294 SHA-256: f72df097c5c911e264b8164b8344518de47b247f584ae5051b49d8c9e9e14ddb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs promising free in-game currency or items for popular games like Roblox and Coin Master. The presence of a "download button" heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted from this sample, but the extensive link farm suggests a phishing or malware distribution attempt.

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/hack-diamond-roblox-game-hack
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/roblox-fun-com-free-robux_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/get-free-spins-in-coin-master_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/roblox-robux-generator-tool_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/como-hackear-coin-master_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/free-account-roblox-with-robux_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/free-robux-just-enter-username-and-password_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/apps-that-give-you-free-robux_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/how-to-get-free-robux-instantly_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/coin-master-apk-mod-free-download_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/denisdaily-free-robux-app_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/daily-free-spins-on-coin-master_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/roblox-free-hair-codes_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/free-spins-coins-coin-master_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/how-to-unblock-roblox-hack-a-wifi-password-on-computer_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/rbxdemon_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/coin-master-gold-cards-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003194.bin
a31e035a949c91bf0b159f5692c0b13fd8c8391493cc26713930db6d44af90a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3194 22180 bytes
font_01_sfnt_off000062d3.bin
17f43ebc1b3e8967d8dded65bb874ade36faded9ae4d5b2d51705155448328c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D3 19380 bytes

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