Malicious PDF — malware analysis report

Static analysis result for SHA-256 8252f71043089df4…

MALICIOUS

PDF

43.0 KB Created: 2020-08-10 18:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0295edacbfc1aa3e33c3e5828f99533 SHA-1: f07832d86ebb733dbb78c0bcc1f8fbb82ab6732f SHA-256: 8252f71043089df4ad3d75b218051ade83ae7567f8157ef59c5c08f3cc62710c
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=abdominal+examination+pdf', indicating the document's intent is to lure users to this malicious site. The ML classifier also strongly flagged this PDF as malicious.

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=abdominal+examination+pdf
    • http://mufuges.swiptt.com/uploads/1/3/2/8/132814930/7610777.pdf
    • http://kulor.citysidelax.com/uploads/1/3/1/3/131380600/1498350.pdf
    • http://files.frontrunnerbooks.com/uploads/1/3/1/1/131163684/ec4de9dadcb.pdf
    • http://files.maryvillekiwanis.org/uploads/1/3/2/3/132303339/9744444.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/lajoxasanage.pdf
    • https://cdn.shopify.com/s/files/1/0430/6318/1473/files/fidobiwoxe.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/83162401742.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7500/files/xibokobeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/1667/4713/files/5764918650.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/60206860157.pdf
    • https://cdn.shopify.com/s/files/1/0437/7785/1550/files/pokemon_emeraldegglocke_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0736/0667/files/fudepupixezaxuke.pdf
    • https://cdn.shopify.com/s/files/1/0433/8538/9221/files/zivobesibemidubusojikuj.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_off00006c8a.bin
6a537984843be65d9c45a74e9c31fec35698ff77f0e96ab6ffa2deaa154bd5c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8A 5112 bytes
font_01_sfnt_off00007dde.bin
0287b9aaf11dd19619a1bbcefa00f7e7cfc918490406041b547d1a7c718bc619		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDE 9856 bytes

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