Malicious PDF — malware analysis report

Static analysis result for SHA-256 427d3d3d6eec6f12…

MALICIOUS

PDF

41.5 KB Created: 2020-08-08 17:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d9556fbfa2e74a600c80ccf89db86a4 SHA-1: c918518df1767690b5aefe1ded9db9c36e87cdf8 SHA-256: 427d3d3d6eec6f129e89a024b56195537100c47c9223fc2721a54f6ca57e04d8
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a malicious redirector link (ttraff.cc) disguised as an English assessment test. This suggests the document's primary purpose is to redirect users to malicious infrastructure. No scripts were extracted from this sample, limiting the analysis of its execution behavior.

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=english+assessment+test+questions+and+answers+pdf
    • http://files.cltreecare.co.uk/uploads/1/3/1/4/131452922/578a3957b5.pdf
    • http://files.usanaapconvention.com/uploads/1/3/1/3/131398547/5569017.pdf
    • http://files.renehindsarts.com/uploads/1/3/1/4/131437775/zaboduzevavivafo.pdf
    • http://files.saeindiana.org/uploads/1/3/1/4/131409037/doketomusobitafuxiga.pdf
    • http://files.superdiscountwigs.com/uploads/1/3/2/8/132814523/tidut.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/kipowawoserixu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9753/files/4563985400.pdf
    • https://cdn.shopify.com/s/files/1/0445/3587/3700/files/digestive_system_histology.pdf
    • https://cdn.shopify.com/s/files/1/0430/0531/3177/files/41445141003.pdf
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/24619526838.pdf
    • https://cdn.shopify.com/s/files/1/0435/0381/2773/files/74351070852.pdf
    • https://cdn.shopify.com/s/files/1/0437/6251/6122/files/what_is_a_8801_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/3335/3627/files/6470939246.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/53618573396.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/pewabe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/potiwabuvufepatene.pdf
    • https://cdn.shopify.com/s/files/1/0430/9182/0695/files/72953930476.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/64442255830.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_off000062d3.bin
6ab0c79d4cacc535e9c01dee69b3c4c46ca4f6caca0e6d2cf59357ecf339b548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D3 5632 bytes
font_01_sfnt_off000075df.bin
434f8d8df6e53afe72839964f74a8d552b127082b014df1fac36410f91b3514f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75DF 10228 bytes

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