Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4b230e224ee168…

MALICIOUS

PDF

32.6 KB Created: 2020-08-23 09:39:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 905515bc4f9402f64f601adcd22f377b SHA-1: bf61061401251f39452f98dc650e000eff7920ef SHA-256: 0e4b230e224ee1682327005cba41cd296d46a292489e73fce96ead68f4f96edd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `ttraff.com`. This URL is embedded within the document body, disguised as a tutorial. The file also exhibits characteristics of a link farm, with numerous external PDF links, many of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=coreldraw+x7+tutorial+pdf+books
    • http://files.icleanservice.co.uk/uploads/1/3/1/4/131407315/5fff2b1e.pdf
    • http://peped.jessiebeefit.com/uploads/1/3/2/6/132681590/ac47f6d06c.pdf
    • http://sonisejul.kaseystertz.com/uploads/1/3/0/7/130739430/ginebawo.pdf
    • http://files.backpackconnections.com/uploads/1/3/1/8/131856285/zuxarexo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/8232/3870/files/historia_cateter_venoso_central.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0431/6974/2999/files/biripe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jatebilebasa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/lisipawoxutugud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9599/9129/files/lugovivoduwipinadutugo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/zudulamoto.pdf
    • https://cdn.shopify.com/s/files/1/0430/8513/6021/files/doxivurekavevel.pdf
    • https://cdn.shopify.com/s/files/1/0433/1533/1227/files/xemosisekevusuvowirolar.pdf
    • https://cdn.shopify.com/s/files/1/0430/9054/2743/files/fupofuvigik.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_off000044da.bin
8bb25fa70359d53870edd9c0e812aea45184ff077823494e61acd8485a0bfbe6
pdf-font-stream PDF embedded font (sfnt) at offset 0x44DA 5384 bytes
font_01_sfnt_off00005750.bin
ca01d3ae01ac59808cb748062ea48a49a2207af7f29ebf2bb68177c308425f42
pdf-font-stream PDF embedded font (sfnt) at offset 0x5750 8836 bytes