Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8e274685bdbadf…

MALICIOUS

PDF

29.5 KB Created: 2020-04-23 19:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e5c7babf8614fb0dd3e64c1187bb1c16 SHA-1: b6108ba74142126cfa00ee2ec61ba9b337f5c8c0 SHA-256: 4e8e274685bdbadfab0abd9c8c9b1be299f9a2fbcc0db1d0fa3015fd982c2b1b
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. The document body contains a mix of seemingly benign text and embedded URLs, suggesting a lure or redirection mechanism. The primary function appears to be distributing links to other malicious documents rather than executing a direct payload from this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://marilusdesigns.com/uploads/1/3/0/4/130488451/130488451.html#champions+league+highlights
    • http://genjisolutions.com/uploads/1/3/1/3/131379856/wukunubabaruvanoxepu.pdf
    • http://akasimple.com/uploads/1/3/0/7/130739060/8fe0c789.pdf
    • http://irishbeerandwhiskeyfestival.com/uploads/1/3/0/7/130739994/ddd9968e.pdf
    • http://dreamersandleaders.com/uploads/1/3/0/4/130483125/mafebefifupuboz_wipekej.pdf
    • http://dynamixhls.com/uploads/1/3/0/4/130488476/5797255.pdf
    • http://batterupchildersburg.com/uploads/1/3/0/4/130488196/kasirifabilerixilit.pdf
    • http://thealexanderbrand.com/uploads/1/3/0/7/130775645/diligesaretutu_wilozemijega.pdf
    • http://ymslivingston.com/uploads/1/3/0/6/130603907/4736866.pdf
    • http://broncoslocker.com/uploads/1/3/0/6/130621052/93c6ce.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004dff.bin
fcd1e97730938e9f3e4e3f919e6266af21123839ffdd7aeb2ca050443a7b3d46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DFF 7208 bytes

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