Malicious PDF — malware analysis report

Static analysis result for SHA-256 67bb4c0788ac22db…

MALICIOUS

PDF

31.2 KB Created: 2020-04-11 04:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 68613222c8c7dc31e4ddb2e2bb887300 SHA-1: 2ee60244e73de1a3d29038aa1e7fee21eccf699b SHA-256: 67bb4c0788ac22db5b7625d0d7f32172906f1fb5b8d2cc8cca4cf042995f1dcc
96 Risk Score

Malware Insights

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

The PDF document contains a lure related to a "Warframe starter pack" and exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. The ML classifier strongly indicates maliciousness, and the presence of many external links suggests an attempt to redirect the user to potentially harmful content or phishing sites. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://www.xmo1.com/uploads/1/3/1/0/131069970/131069970.html#warframe+starter+pack
    • http://quetpieschildrenboutique.com/uploads/1/3/0/5/130551486/nabututobuget_falivofifav.pdf
    • http://outingsmanager.com/uploads/1/3/0/5/130588581/8d302c823d2bdce.pdf
    • http://katasana.shop/uploads/1/3/0/6/130604501/588ea4e1.pdf
    • http://waukeshalawncare.com/uploads/1/3/0/6/130604101/xilevofisev_fekedumir.pdf
    • http://ainpain.com/uploads/1/3/0/5/130590308/miwabaxaniraropob.pdf
    • http://arturotejeda.com/uploads/1/3/0/6/130620640/ba6eb.pdf
    • http://innerfitmanagement.com/uploads/1/3/1/4/131406739/cc419afb20610.pdf
    • http://cleaalsip.com/uploads/1/3/0/8/130874362/b5f1ab.pdf
    • http://msmogasclessroom.com/uploads/1/3/0/9/130969415/namin.pdf
    • http://cpanel.lancerpep.org/uploads/1/3/1/4/131406498/eec0590.pdf
    • http://911flex.net/uploads/1/3/0/7/130776063/514235719fd.pdf
    • http://wiccadsisters.com/uploads/1/3/1/4/131453188/ganoxumesalamoro.pdf
    • http://joe-otoole-photography.com/uploads/1/3/0/7/130776786/sazoza.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_off00004f7d.bin
d3d123564f35c40d6ec74abd394e8af96d74ea35018f7564a6d418099e64c0c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F7D 8536 bytes

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