Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac095d148fc927c…

MALICIOUS

PDF

44.8 KB Created: 2020-08-07 14:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 070acaeacc0ebad6e451c85cc9a4f05a SHA-1: 031d36d794216b4fa05d47fa3cea60a900debabc SHA-256: 4ac095d148fc927c94e0a70f4a67ef5c0639673387c5c0a305be299312484a07
150 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=prone+positioning+in+severe+acute+respiratory+distress+syndrome+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain this URL and other links to Shopify domains, suggesting a link farm or SEO manipulation tactic to distribute malicious content. 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=prone+positioning+in+severe+acute+respiratory+distress+syndrome+pdf
    • http://files.trinityepiscopalmarshall.org/uploads/1/3/0/7/130775150/7815968.pdf
    • http://files.straitfromthefarm.com/uploads/1/3/0/7/130739415/a0338e97f.pdf
    • http://files.aarondeslatte.com/uploads/1/3/1/6/131606392/7023624.pdf
    • http://files.srikrishnapools.com/uploads/1/3/0/8/130813796/sojurafunapo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1381/5966/files/finereb.pdf
    • https://cdn.shopify.com/s/files/1/0432/4550/2626/files/83715258432.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/nojekesurorepupixeparunes.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/durezupadunafi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/wonediwino.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6959/files/vumijixopomo.pdf
    • https://cdn.shopify.com/s/files/1/0441/4645/8776/files/ireland_work_permit_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/jirezepizowipupu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8646/files/63999763326.pdf
    • https://cdn.shopify.com/s/files/1/0437/7870/3521/files/86236235579.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/27028514601.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_off00006ba5.bin
2a13cbc82d3c61c17f1feb2c3c57e387a45da0778f344a31fb437c32f9a0a149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA5 5604 bytes
font_01_sfnt_off00007eb0.bin
79dfe505ce8a0df948d46992e43f7be164cfb1f46f56a7a5fa6d6548cad2f4db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB0 12276 bytes

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