Malicious PDF — malware analysis report

Static analysis result for SHA-256 c731b0b99392e624…

MALICIOUS

PDF

39.7 KB Created: 2020-08-14 00:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9a34ea4be0af1ab8c2dc81c36e4e762 SHA-1: dcad79a153d7f31ca81b6a66082a405ba8453fa3 SHA-256: c731b0b99392e624db61ab1484206c9336ac8cf92359f52559d86c216e8649bf
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links, many pointing to a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to manipulate search engine results or lure users to malicious sites. The primary attack pattern involves redirecting users to potentially harmful content.

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=abstract+wallpaper+hd+for+mobile+free
    • http://files.mission-justice.org/uploads/1/3/1/3/131380083/toziwuboge.pdf
    • http://bibeben.mrwegnerinroom92.com/uploads/1/3/0/9/130969656/meragubero_bodejinemorire.pdf
    • http://files.ailsacatherinestevenson.com/uploads/1/3/0/7/130739699/judose-putijunigukus-pirele.pdf
    • http://files.emsteps.com/uploads/1/3/1/4/131438308/ea6f06f19a5775.pdf
    • http://kudeguba.saranyawellness.com/uploads/1/3/0/7/130775818/6853108.pdf
    • https://cdn.shopify.com/s/files/1/0439/2216/1832/files/45961199793.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65587220918.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/tajutiretafesib.pdf
    • https://cdn.shopify.com/s/files/1/0438/2985/4368/files/72593707604.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/kinimerugexanumi.pdf
    • https://cdn.shopify.com/s/files/1/0441/2535/6184/files/borderlands_2_minecraft_area.pdf
    • https://cdn.shopify.com/s/files/1/0432/5353/0782/files/duxikuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/4925/4048/files/adobe_reader_for_pc_apk.pdf
    • https://cdn.shopify.com/s/files/1/0430/8221/9674/files/zomofivixowiju.pdf
    • https://cdn.shopify.com/s/files/1/0433/1392/2206/files/waxufajomipufabixepi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0802/3966/files/jesanakifaxox.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_off00005db5.bin
42912d2aeedb113d76be18639272960c2bf9b29ae03a94b6075b2a7b7f658578		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB5 5616 bytes
font_01_sfnt_off000070a8.bin
150728a08a13f65ba9ef0937e1da5b7f7e5c92cb4dbf8ece3b1743146a6914be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A8 9656 bytes

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