Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81be4334037ca95…

MALICIOUS

PDF

43.2 KB Created: 2020-08-07 13:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a020fc08061a90ddc269c0ec120b523b SHA-1: 243f609e52026cf1c0951f66ae5580ddacef8722 SHA-256: c81be4334037ca95e4866aa3e31f54fbda55f539a3b8ba55ca358dcd27239fb7
150 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'calentador solar casero con botellas de plastico pdf', suggesting a scam or phishing attempt. The presence of numerous other links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. 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.com/pify?keyword=calentador+solar+casero+con+botellas+de+plastico+pdf
    • http://files.allstarclean.org/uploads/1/3/0/7/130776489/zewurozokijut.pdf
    • http://files.brewercustomguitars.com/uploads/1/3/1/3/131379671/6634625.pdf
    • http://files.peacockpastries.com/uploads/1/3/0/7/130738814/bejewot.pdf
    • https://cdn.shopify.com/s/files/1/0434/0488/6166/files/divazoliwokidimawu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1993/4628/files/rogesubetomuga.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/82948573724.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7988/files/zixulipezizesat.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/76480395380.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/discord_webhook_github.pdf
    • https://cdn.shopify.com/s/files/1/0431/2029/6090/files/82400611858.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4938/files/canon_rebel_t3i_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0135/files/sozerobipujejisodevozomi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/51600084513.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51906755497.pdf
    • https://cdn.shopify.com/s/files/1/0432/8072/8224/files/french_surnames_list.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_off00006823.bin
78266cd08bab568063f384ba237544bd1bb5107126b4742d785b6c7e3422fc82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6823 5196 bytes
font_01_sfnt_off000079d1.bin
242e128062518e23621532db629b8031c1aa2752505a533c427f2f06dedfa6a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D1 11112 bytes

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