Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3ccccaad91c3fa…

MALICIOUS

PDF

35.9 KB Created: 2020-08-02 15:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5569fff293f433cabb98232534e6fe6 SHA-1: 43e88c2786331766eb3969c9e2f5e41704fc37b1 SHA-256: 6c3ccccaad91c3fac340cc0d7d9949a2854d4670c6ac2682316234b35ef8bbd6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body contains obfuscated text and a URL that appears to be part of a link farm, suggesting an attempt to manipulate search results or lure users to malicious content. No scripts were extracted, but the presence of embedded URLs and the redirector heuristic strongly suggest a phishing or malicious redirection attack.

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=godsmack+go+away
    • http://files.springlineseafood.com/uploads/1/3/1/0/131069869/xapurusig.pdf
    • http://files.ll.business/uploads/1/3/2/6/132695387/pevubobowet.pdf
    • http://files.naturallyminded.co.uk/uploads/1/3/0/7/130776573/9523606.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/8622/3262/files/23720708125.pdf
    • https://cdn.shopify.com/s/files/1/0429/5655/4394/files/sejobilupatowesimolig.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/1646350103.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2866/files/10_pin_shuffle.pdf
    • https://cdn.shopify.com/s/files/1/0436/2980/5726/files/76414534380.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7616/files/zovodu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7135/4533/files/bipomosutotadodefazokowi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/febipak.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/43543238887.pdf
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/93432855247.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1942/files/93114162403.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/lubogudegukibos.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/93602138796.pdf
    • https://cdn.shopify.com/s/files/1/0428/4104/7206/files/71195401725.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004bc1.bin
fe7b928df6bb1639d4317577e87abd61835b6f5e926023e82a98384e304ee463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BC1 5420 bytes
font_01_sfnt_off00005e3f.bin
86750de6a8c71d10ebea1d8d7c5a4b27951ae89741452b3f691cc63b41a3f71b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3F 10824 bytes

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