Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d97d5bec584784…

MALICIOUS

PDF

43.9 KB Created: 2020-08-18 14:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a681f205a3f12837ed0f8744e884dac SHA-1: 8cc2c7405282d38105bd728f0f0b2ce958cd68fb SHA-256: 38d97d5bec584784a1cc08c180842419aae808bf4c32bc8fff1f2229965d668e
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/pify?keyword=authorship+guidelines+medical+journals`. This URL is presented within the document body, suggesting a lure to trick users into clicking it. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on `cdn.shopify.com`. The ML classifier 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.ru/pify?keyword=authorship+guidelines+medical+journals
    • http://files.lcorelca.org/uploads/1/3/2/6/132681164/a8c53e40e7.pdf
    • http://files.debirestone.com/uploads/1/3/0/7/130776088/7680944.pdf
    • http://files.healersnews.net/uploads/1/3/1/4/131408017/dijewomiladid_tozekazaliwem_wixozisigil_lewag.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8949/files/91756007916.pdf
    • https://cdn.shopify.com/s/files/1/0432/7361/7568/files/povuxakobugazugewidetox.pdf
    • https://cdn.shopify.com/s/files/1/0433/9977/4364/files/ebbelwei_express_fahrplan.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/kuxadajisugovigisad.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/9753655756.pdf
    • https://cdn.shopify.com/s/files/1/0435/2727/4645/files/learning_and_development_framework.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/85742962145.pdf
    • https://cdn.shopify.com/s/files/1/0431/5050/8194/files/jogozinepejezigujizujibip.pdf
    • https://cdn.shopify.com/s/files/1/0434/1773/1229/files/ziniputigomu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fufalelavajukunegaxiz.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_off00006d9e.bin
c509345264ee1e00bae913748d497be46ff8d69779ab4a2cb99adf0cc16fbbae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9E 5552 bytes
font_01_sfnt_off00008055.bin
4f7a027594bbba431ad0d4062adbc89f90e100ed4a7eddf6ba720c8dd471bcfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8055 10076 bytes

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