Malicious PDF — malware analysis report

Static analysis result for SHA-256 407a8e18b5ac799d…

MALICIOUS

PDF

41.9 KB Created: 2021-05-14 21:47:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a87e09804830c0bdbd744ddc644130aa SHA-1: 550a655ecffbcb8343141abcd86b8cb187058969 SHA-256: 407a8e18b5ac799de7261d6f134c62f1aa58575b39979031d95cfb9161052db6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a document body that promotes free game currency and codes, indicating a phishing or scam lure. The presence of a large number of external links, many pointing to PDF files with SEO-like slugs, suggests a link farm designed to drive traffic to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/roblox-gift-card-free-codes-game-hack
    • http://colsaf.co/images/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • http://colsaf.co/images/free-flip-master-coins_GM406889139.pdf
    • http://colsaf.co/images/coin-master-daily-free-spins-today_GM406889139.pdf
    • http://colsaf.co/images/reddit-coin-master-free-spins_GM406889139.pdf
    • http://colsaf.co/images/show-me-how-to-get-free-robux_GM431946152.pdf
    • http://colsaf.co/images/coin-master-spin-link-today_GM406889139.pdf
    • http://colsaf.co/images/minecraft-free-ios_GM479516143.pdf
    • http://colsaf.co/images/free-robux-codes-not-used_GM431946152.pdf
    • http://colsaf.co/images/free-spins-on-coin-master-generator_GM406889139.pdf
    • http://colsaf.co/images/100-robux_GM431946152.pdf
    • http://colsaf.co/images/free-spins-coin-master-daily_GM406889139.pdf
    • http://colsaf.co/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://colsaf.co/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdf
    • http://colsaf.co/images/spin-coin-master_GM406889139.pdf
    • http://colsaf.co/images/rbx-website_GM431946152.pdf
    • http://colsaf.co/images/coin-master-free-spins-2021_GM406889139.pdf
    • http://colsaf.co/images/free-spin-coin-master-hack-2021_GM406889139.pdf
    • http://colsaf.co/images/spin-coin-master-hack_GM406889139.pdf
    • http://colsaf.co/images/free-minecraft-skins-java_GM479516143.pdf
    • http://colsaf.co/images/coin-master-hack-ios-no-jailbreak_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047ef.bin
e21a3af8bf6f875d9e66f1be688c23f4a034c6c5146ca93c6bb3ee816401d818		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47EF 24764 bytes
font_01_sfnt_off00008051.bin
9c63177eafc3ac88b713a1cd2104529c3a7676e5ce127b5a80c9c06234e3cf10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8051 18572 bytes

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