Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dad5923ca4d2442…

MALICIOUS

PDF

41.2 KB Created: 2020-08-04 18:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d90ede1c26c12845e70984d6fc2d3c05 SHA-1: e195a512a7b3923bd5323c8b685bee03ed975125 SHA-256: 9dad5923ca4d2442bbbf1d9bd709f2d011db77325ca5a39320e5db9a60defcc0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

This PDF file contains multiple embedded links, with a critical heuristic firing for a malicious redirector URL (ttraff.com). The document body, though heavily obfuscated, contains the same redirector URL. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=materiales+aislantes+conductores+y+semiconductores+pdf
    • http://files.stress-resilience.com/uploads/1/3/1/3/131380001/jewuvemanamusololaze.pdf
    • http://files.jpmazzaro.com/uploads/1/3/0/8/130813357/fezomisexepag.pdf
    • http://files.saginawbaywatertrail.com/uploads/1/3/1/3/131398322/c7f93e6890b0e5c.pdf
    • http://files.tt-motorcycles.com/uploads/1/3/2/7/132740343/jivakunidonon.pdf
    • http://files.northwestdistribution.net/uploads/1/3/1/4/131437330/25593df.pdf
    • https://cdn.shopify.com/s/files/1/0437/9066/3832/files/53594250474.pdf
    • https://cdn.shopify.com/s/files/1/0436/9180/2777/files/27208675949.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lunugituvalu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3391/8616/files/xaxivelumin.pdf
    • https://cdn.shopify.com/s/files/1/0428/2001/0140/files/xfinity_universal_remote.pdf
    • https://cdn.shopify.com/s/files/1/0431/5778/2690/files/siwadajijozenugavuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25696514874.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/should_of_just_called_him_whiskey.pdf
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/negafukilure.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66689816557.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/temut.pdf
    • https://cdn.shopify.com/s/files/1/0437/1113/5894/files/kidepejila.pdf
    • https://cdn.shopify.com/s/files/1/0437/5271/8494/files/45382076776.pdf
    • https://cdn.shopify.com/s/files/1/0430/3853/9927/files/sukinakalizixavoxazam.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/
    • https://cdn.shopify.com/s

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000636b.bin
a758a11125d10590e332488383c13a17032a3b6c0edea8a4ba4f6c031bebf49f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636B 5408 bytes
font_01_sfnt_off000075d0.bin
22c7b07f523142b86b6a081c22187363fa29412ea2f48672bad20a5675458014		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D0 10240 bytes

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