Malicious PDF — malware analysis report

Static analysis result for SHA-256 4208f6bbed8b7d73…

MALICIOUS

PDF

44.6 KB Created: 2020-07-28 06:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba4dcfbb4f7d50dd9963888c77eaa1a7 SHA-1: 4e090edd5d929b0735109a2fbe34b32b5790cbbd SHA-256: 4208f6bbed8b7d739c9c3b9a8e37c19693c144fffac5dc42f48a562d77d7f4b9
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to a known malicious URL. Additionally, PDF_SEO_LINK_FARM indicates the presence of a link farm with 16 external PDF links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Conference call for papers template', suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=conference+call+for+papers+template
    • http://files.pasinfonia.org/uploads/1/3/2/6/132681558/luroru-putas-wasonorofadi-bukafutominosi.pdf
    • http://files.animalprograms.org/uploads/1/3/1/1/131163705/55cbfdd1e6.pdf
    • http://files.thesaviorsstory.com/uploads/1/3/2/6/132681647/b4ed2d753bf.pdf
    • http://files.thesaviorsstory.com/uploads/1/3/2/6/132681647
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54183348773.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5309/files/47636475081.pdf
    • https://cdn.shopify.com/s/files/1/0430/1648/7065/files/4021899241.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/nopapozetove.pdf
    • https://cdn.shopify.com/s/files/1/0435/1908/2651/files/12819772937.pdf
    • https://cdn.shopify.com/s/files/1/0436/0699/9203/files/jujitapidigazutiwuzof.pdf
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/25221633857.pdf
    • https://cdn.shopify.com/s/files/1/0429/2401/5783/files/2545793646.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/zowamafemaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/38332943313.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/67832913242.pdf
    • https://cdn.shopify.com/s/files/1/0435/6944/7073/files/burituwugaduf.pdf
    • https://cdn.shopify.com/s/files/1/0430/6570/4599/files/47976165424.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_off000071b5.bin
96c606d1edc5350db2e50c7b05f82e35dbee4e891319168d7a945d31260f6990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B5 4924 bytes
font_01_sfnt_off00008252.bin
f8b25a1534e05ff6e7f9f0e9377911c3a057dc5000362e6241e7691d2207ae55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8252 10192 bytes

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