Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c5b80d535aa9f7…

MALICIOUS

PDF

36.0 KB Created: 2020-08-24 04:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dc03b6b78175a7ac083ad8e91a1ad68 SHA-1: f953a941ec71c9df7a613926842b66958c374abb SHA-256: 99c5b80d535aa9f7dc42f1bfc3b32bd4d4c2608b6e2996a16360db92e5c8766a
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and heuristics suggest a lure to download a font pack, which is likely a pretext for delivering malware. The PDF_SEO_LINK_FARM heuristic indicates a large number of links, many hosted on Shopify, pointing to a potential link farm or distribution network. The SE_DOWNLOAD_BUTTON heuristic further supports the lure-based attack pattern.

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ttraff.cc/pify?keyword=adobe+illustrator+fonts+pack
    • http://files.bluemarlin3grancanaria.com/uploads/1/3/1/4/131437532/wilamejupusuvitamiv.pdf
    • http://files.cayugalakehouse.net/uploads/1/3/2/7/132712326/wabef.pdf
    • https://cdn.shopify.com/s/files/1/0428/7420/8415/files/14885033727.pdf
    • https://cdn.shopify.com/s/files/1/0429/8457/1031/files/74668041590.pdf
    • https://cdn.shopify.com/s/files/1/0431/5388/3293/files/rolisiliketa.pdf
    • https://cdn.shopify.com/s/files/1/0457/6644/3164/files/93662274079.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9966/files/92469451272.pdf
    • https://cdn.shopify.com/s/files/1/0437/8660/0609/files/buderus_logamatic_rc310_bedienungsanleitung.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3287/files/kabepabak.pdf
    • https://cdn.shopify.com/s/files/1/0436/9317/9030/files/daily_attendance_sheet_in_excel.pdf
    • https://cdn.shopify.com/s/files/1/0427/9782/6207/files/rudogigajizamopo.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/zufugawabid.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f28.bin
ebf60573d5aad872b7e489648b9d4c9b08a2a231d09410eede42cb445f1cddc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F28 5344 bytes
font_01_sfnt_off00006156.bin
48b0d7c9c1e895214a981eaa325fa9ee47c4a41ac487e274065430455e887423		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6156 9988 bytes

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