Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d6b4a3936c2405…

MALICIOUS

PDF

68.5 KB Created: 2020-08-10 11:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc7d698ba456ddfc87c9c98a8f9e6077 SHA-1: ff31ce0fcef33493cd604334cdf1a910cfab223d SHA-256: 21d6b4a3936c2405caed57fcd110c02fa1df8ad860736f1a822b8f589fa1d39f
128 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The document body contains urgency language, further supporting a malicious intent.

Heuristics 4

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=acute+ischemic+stroke+pdf
    • http://files.emmapickettbreastfeedingsupport.com/uploads/1/3/0/8/130813401/wubowovopuvapuj.pdf
    • http://files.jchambersconstruction.com/uploads/1/3/1/0/131071256/1ea2e0623.pdf
    • http://files.perrodisefarmsllc.com/uploads/1/3/1/4/131438018/dojuwol.pdf
    • https://cdn.shopify.com/s/files/1/0435/7203/5739/files/nightmare_on_my_street.pdf
    • https://cdn.shopify.com/s/files/1/0451/3182/5317/files/97008226865.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8535/files/bodufuvonovu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3321/5644/files/12541410294.pdf
    • https://cdn.shopify.com/s/files/1/0431/0129/0650/files/resovisudamirewuvad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9540/9311/files/dictionary_english_to_english_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0436/3363/9584/files/jaxilafijinodasarex.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/11085342493.pdf
    • https://cdn.shopify.com/s/files/1/0430/6731/0231/files/fugizikajom.pdf
    • https://cdn.shopify.com/s/files/1/0437/7113/4106/files/16416464247.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/mesibezidi.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_off0000cb83.bin
5daf4b6b7be56d8224c8a3c7ce701f607b6a3084660f01f7870c795d142cdcec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB83 5204 bytes
font_01_sfnt_off0000dd14.bin
9bc2e0c2b0d95e50b234f047dd48d7d25924307c03f41c77194fc6d320bbcdf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD14 12664 bytes

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