Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3d80c6a103acd4…

MALICIOUS

PDF

47.6 KB Created: 2020-07-30 14:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: baa59111a7ec17a73b44cf37823b67ce SHA-1: 7e7398b09c4b93016186b76695eaf1b7af829e38 SHA-256: 9f3d80c6a103acd4ad3924426788ed28be7bc52240532c14f274cf3342c58653
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a mass external PDF link farm. Another critical heuristic, PDF_MALICIOUS_REDIRECTOR_LINK, flags a link to ttraff.com, a known malicious redirector. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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=important+days+in+pdf+format
    • http://files.corshamcreativemarket.co.uk/uploads/1/3/1/3/131383719/vafila.pdf
    • http://files.allisanellwood.com/uploads/1/3/0/7/130776490/vofawedapo_nalupufamepeti_lemafaxajogeno.pdf
    • http://files.blackbirdecor.com/uploads/1/3/1/3/131398204/2651329.pdf
    • http://files.pattilooneyphotography.com/uploads/1/3/0/7/130776589/wijonagufaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/3772/0733/files/dutugigelatikosuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8818/3456/files/86275309166.pdf
    • https://cdn.shopify.com/s/files/1/0434/7976/1061/files/33791026917.pdf
    • https://cdn.shopify.com/s/files/1/0429/3502/5831/files/87713416992.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/22442901251.pdf
    • https://cdn.shopify.com/s/files/1/0428/7656/7711/files/poveraj.pdf
    • https://cdn.shopify.com/s/files/1/0429/9112/4643/files/latabinojigokegosuvubele.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/9735298409.pdf
    • https://cdn.shopify.com/s/files/1/0435/1036/6362/files/jobeguxabolibiminenobumi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4005/files/39499292610.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6681/files/titopasaruzeg.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/
    • https://cdn.shopify.com/s/files/1/0429/3502

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f25.bin
9c760ce6f04c6f17bf3c63fb5b191b3c083e9167b72aa5966c2029f38ea6d060		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F25 4864 bytes
font_01_sfnt_off00008f83.bin
c023be0b1463c898d5ea0c52d9981fad4b19276b570741c0acd2c0f004b8af73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F83 9928 bytes

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