Malicious PDF — malware analysis report

Static analysis result for SHA-256 a594df2e5c3c78bd…

MALICIOUS

PDF

43.8 KB Created: 2020-08-11 17:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 510e8febc0941435bd3ec9960e3bb5e7 SHA-1: 1ea494ec932eeeb3fb27d3c28203519e048d81e8 SHA-256: a594df2e5c3c78bd044e1045a91c64febcf7a49f51b5d7923e6b275ec0c8c276
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO poisoning or to distribute malicious content. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=days+of+the+week+in+spanish+worksheet+pdf'. The document body, though partially corrupted, contains text related to 'Days of the week in spanish worksheet pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The presence of numerous Shopify-hosted PDF links further indicates a link farm strategy.

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=days+of+the+week+in+spanish+worksheet+pdf
    • http://files.johnfnorland.com/uploads/1/3/1/3/131381078/sujewugiwi.pdf
    • http://tavipofet.housingtrust.org/uploads/1/3/1/0/131070450/be074be625b55.pdf
    • http://files.firstclassathletics.com/uploads/1/3/1/4/131406701/1952b245e.pdf
    • http://files.indorsia.com/uploads/1/3/0/7/130775257/meveziwagom_zesima_difosodesote.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/blood_pressure_chart_by_age_and_height.pdf
    • https://cdn.shopify.com/s/files/1/0435/6974/1983/files/xanojurogumisikasakal.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1717/files/78176218656.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0735/files/33364705216.pdf
    • https://cdn.shopify.com/s/files/1/0430/8847/8365/files/rebopin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6292/7263/files/introduction_to_econometrics_stock_watson.pdf
    • https://cdn.shopify.com/s/files/1/0431/5483/3557/files/lebabule.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/48560351385.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5671/files/gugexunazepisavedepa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/introduction_to_statistical_quality_control.pdf
    • https://cdn.shopify.com/s/files/1/0432/9209/8724/files/jisujakesiniziwafuvo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0133/8266/files/breeds_of_cattle_and_their_characteristics.pdf
    • https://cdn.shopify.com/s/files/1/0437/2683/1784/files/88187383973.pdf
    • https://cdn.shopify.com/s/files/1/0434/4043/9446/files/fosidasafakunugen.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_off00006c58.bin
8a6f51420ca490b7513468fccfef4b255fc365100ccf2ff2da665c32449c0500
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C58 5356 bytes
font_01_sfnt_off00007e98.bin
95560f2190e6988026226295b8f3c29e167063cff4ca8729f63b3f82eda9789a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E98 10192 bytes