Malicious PDF — malware analysis report

Static analysis result for SHA-256 669ea9f8b149992b…

MALICIOUS

PDF

42.0 KB Created: 2020-08-05 15:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd333cfc582a51fdc729114eff954a6a SHA-1: 670c7959b61fbbd7f4fde098ba961ce578810bbd SHA-256: 669ea9f8b149992befa56c501ccb4139c1e356a7773d74f1662fbad971ce21a2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=rosamunde+pilcher+books+pdf'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the same malicious URL and several Shopify URLs.

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.cc/pify?keyword=rosamunde+pilcher+books+pdf
    • http://files.ritafeutl.com/uploads/1/3/1/3/131379306/sedeli.pdf
    • http://files.bdickinsonart.com/uploads/1/3/1/6/131637055/gibosefuzoko-dusobeforadewiz-rugawiwe-midogoz.pdf
    • http://files.jessicamilne.com/uploads/1/3/1/3/131381658/4124516.pdf
    • http://files.mutouchfootball.com/uploads/1/3/0/7/130775868/dofutoreruv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0741/7253/files/53172792379.pdf
    • https://cdn.shopify.com/s/files/1/0434/3808/0166/files/74212992510.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/10452507035.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4042/files/vinaverul.pdf
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/40678934973.pdf
    • https://cdn.shopify.com/s/files/1/0427/6997/3415/files/bacterias_patogenas_para_el_hombre.pdf
    • https://cdn.shopify.com/s/files/1/0435/8393/0527/files/70394487147.pdf
    • https://cdn.shopify.com/s/files/1/0431/7406/8390/files/tavakodavitizonoxeme.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/vubezafavolojedudivol.pdf
    • https://cdn.shopify.com/s/files/1/0432/0555/8436/files/45314750376.pdf
    • https://cdn.shopify.com/s/files/1/0429/4665/8463/files/zaboputela.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/77009114987.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_off000065f7.bin
4e9f0ad6467939ebdd22bb9e8d1a8a99fbe980a35c9a5dc68d452b15461732da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F7 5608 bytes
font_01_sfnt_off000078df.bin
04a8e02532103727e9becf9028b0dfab6ef173122d7deb276aeaef17762cd832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78DF 10080 bytes

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