Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc576fec036c161…

MALICIOUS

PDF

67.8 KB Created: 2020-08-14 00:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c44a2efcf8be0f620f117f4dbb84bbd SHA-1: 8eb545c0feb8314caed366549f6188e975d80c93 SHA-256: cfc576fec036c1615d7b30f10031f507d6696b7dd1d67653c69968080240ebe0
120 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as an answer key for a guided reading activity. The PDF also hosts a large number of external links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning attempt. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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=guided+reading+activity+20-+2+answer+key
    • http://files.youdesignleather.com/uploads/1/3/0/8/130874683/3778047.pdf
    • http://files.saracarterdance.co.uk/uploads/1/3/1/4/131407492/sajevabitapusig-nemavuditem.pdf
    • http://files.mrsbsmusicclass.com/uploads/1/3/0/9/130969965/sagamaxusinidureri.pdf
    • http://pepopo.makikicommunitygarden.com/uploads/1/3/0/7/130775162/7631699.pdf
    • http://wowes.num-uno.com/uploads/1/3/1/6/131607131/f9cca4be12.pdf
    • https://cdn.shopify.com/s/files/1/0430/2913/5521/files/45084647924.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/asbestosis_y_silicosis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25843483079.pdf
    • https://cdn.shopify.com/s/files/1/0436/7794/1913/files/98733273331.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/54095368306.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/14707263974.pdf
    • https://cdn.shopify.com/s/files/1/0438/6825/8469/files/vimuj.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/causas_del_bullying_segun_autores.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0497/files/bovibusovinadidadupokox.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/42620819039.pdf
    • https://cdn.shopify.com/s/files/1/0430/1642/1529/files/topuxobeferazera.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8277/files/53220690841.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_off0000c6e9.bin
214d5c67ed4c35d7991f79808b682435807fde6f7f258ec82f5cb485139ac465		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 5728 bytes
font_01_sfnt_off0000daa5.bin
b4f384098284a9be2c47479ef9c14f0651f499571bb49c82b05ec7c8474fb2d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 10916 bytes

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