Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a1d0edad1abb45…

MALICIOUS

PDF

44.1 KB Created: 2020-08-21 09:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf21ef9b692f0052b8dcde3cdcb2accb SHA-1: 59f83419081c31fb3849f0d509c81fbe39d8df2d SHA-256: f5a1d0edad1abb45b4374b917f6f75b8596d63d5d974b3068c6f9f6f7d04ed30
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure at 'ttraff.cc'. The document body, though heavily obfuscated, contains the text 'septic shock guidelines pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=septic+shock+guidelines+pdf
    • http://tuvis.ethiopremier.com/uploads/1/3/2/6/132681352/7f8172df63d13.pdf
    • http://files.italianschoolofcycling.com/uploads/1/3/2/6/132696145/1599060.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/lazulamugegudapuxojiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/3946/4341/files/suffix_worksheets_5th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/8771151781.pdf
    • https://cdn.shopify.com/s/files/1/0441/2496/2968/files/gotuzawolituvupuvovuf.pdf
    • https://cdn.shopify.com/s/files/1/0439/2199/7979/files/kebibovewatakelaxiza.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/surixogugabibigozirifom.pdf
    • https://cdn.shopify.com/s/files/1/0432/6365/6099/files/wow_display_id.pdf
    • https://cdn.shopify.com/s/files/1/0436/9462/0837/files/anemia_severa_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0434/7795/8816/files/que_es_anabolismo.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_off00006e1c.bin
c0ec624584746541411531c613e82d3f0607e59ae93f2f33732d13f44f378e42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1C 5276 bytes
font_01_sfnt_off00008011.bin
cccfbf941ba319b5e1894ec777196c778633c43c06a7838c014b64c90a0b28d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8011 10552 bytes

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