Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78ecb9c5462bf82…

MALICIOUS

PDF

46.6 KB Created: 2021-05-16 16:10:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: eecc5ad6bc95458fa8579713ff31c135 SHA-1: 84c7674974f3490685d7a61d5ec2f39b2db62de4 SHA-256: d78ecb9c5462bf8214c19accabbad895506887e10e8a51446861964224772d6e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to SEO spam pages, likely designed to drive traffic or host further malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the 'ML_NYX_PDF_MALICIOUS' score suggests a high probability of malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/406889139/how-to-hack-coin-master-android-game-hack
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/free-spins-on-coin-master-2021_GM406889139.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/hack-crack-for-coin-master-currency_GM406889139.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/minecraft-auto-miner-hack_GM479516143.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/free-unlimited-coin-master-online-tool_GM406889139.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/free-coin-master-cards-link_GM406889139.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/how-to-get-free-spins-for-coin-master_GM406889139.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/free-robux-without-doing-anything_GM431946152.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/free-robux-human-verification_GM431946152.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/free-apk-mods-coin-master_GM406889139.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/hack-coin-master-app-ios_GM406889139.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/how-to-hack-roblox-passwords_GM431946152.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/get-free-robux-today_GM431946152.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/coin-master-hacks-that-actually-work_GM406889139.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/coin-master-free-spins-app-android_GM406889139.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/master-free-spin-and-coin-link_GM406889139.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/coin-master-cards-hack_GM406889139.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/coin-master-hack-xyz-apk-download_GM406889139.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/freerobux-co_GM431946152.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/coin-master-free-spins-link-31-march-2021_GM406889139.pdf
    • http://www.clooetherattorneys.com/uploaded_files/userfiles/files/minecraft-pe-hacks_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004afa.bin
7932d813184a0295854a343bfdfa978e0ff324a23d8ec7f8319bb2d55431955b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AFA 30772 bytes
font_01_sfnt_off00008a4a.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4A 2880 bytes
font_02_sfnt_off00009435.bin
bcfa17c5709dab1c3cba96da80ba62d2e7141defff98e25088c987d76bf65ce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9435 18056 bytes

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