Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38dee09e761a542…

MALICIOUS

PDF

42.0 KB Created: 2020-08-06 09:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75710b890e2820e171f6425d1cca88cc SHA-1: 2c18055525a1d2c1296146733aa9c0cb42b4d706 SHA-256: b38dee09e761a542d87df49e321a709c77700c48e021c717ae8a0c4093cb80ba
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used in SEO spam or link farm operations to drive traffic to malicious sites. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is disguised as a PDF about anemias. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. The presence of many Shopify-hosted PDF links suggests a coordinated effort to distribute malicious content.

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=tipos+de+anemias+y+sus+causas+pdf
    • http://files.tarpanmanagers.com/uploads/1/3/1/3/131380292/f03cbe3791.pdf
    • http://korokenaf.stmarysofthelakeff.com/uploads/1/3/1/4/131453109/abca19997b42d45.pdf
    • http://files.hornbywine.com/uploads/1/3/1/1/131164488/1263627.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/miveguxuxububepevomozit.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1296/files/18145067962.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7142/files/82772932658.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64238793182.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/salem_tractor_parts.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuxovozukirofavekejob.pdf
    • https://cdn.shopify.com/s/files/1/0437/2096/6293/files/rebalar.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/suxidigeluzigugubu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6346/6391/files/26586198576.pdf
    • https://cdn.shopify.com/s/files/1/0427/7587/1654/files/toweliwaf.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_off00006670.bin
15df036bbb42320e0d5678e4145895be173a8ec5ad47b429146c66a8a12c6560		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6670 5224 bytes
font_01_sfnt_off00007835.bin
22944c58a043d91b96af97f9526b662421c4ea530da7d5e212b35b16061c4a76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7835 10260 bytes

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