Malicious PDF — malware analysis report

Static analysis result for SHA-256 818f116e1dd5151d…

MALICIOUS

PDF

44.8 KB Created: 2020-03-10 03:33:39 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 925f9d13128c4b322abdff75dfcf06cf SHA-1: 54e9dc4c6af05ab026c2709d4b67d4fd862bab42 SHA-256: 818f116e1dd5151d437280785c4e3f44876f6934e84b1834f924359d0659a3eb
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to host or link to numerous other documents. No scripts were extracted, but the extensive link farm points to a content-distribution or redirection scheme.

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://mta-sts.theretreatatmillerslanding.com/uploads/1/3/0/4/130489499/130489499.html#most+useful+english+sentences+pdf
    • http://www.mbcp.net/uploads/1/3/0/4/130483808/fusomib.pdf
    • http://mta-sts.mail.juliacdupuis.com/uploads/1/3/0/9/130969525/722344.pdf
    • http://terangahau.co.nz/uploads/1/3/0/6/130620916/d55ef826a19.pdf
    • http://www.leveraanalytics.com/uploads/1/3/0/6/130639136/6792160.pdf
    • http://hydrolacticsystem.com/uploads/1/3/0/5/130543289/bexemu_pudadis_peduxuravimuzu_bofejuda.pdf
    • http://political411.com/uploads/1/3/0/6/130620828/7053350.pdf
    • http://ineavet.com/uploads/1/3/0/6/130603956/56b7df.pdf
    • http://questerspvp.com/uploads/1/3/0/8/130873867/b01797494510.pdf
    • http://morganhighway.band/uploads/1/3/0/4/130435722/1725366.pdf
    • http://ishagya.com/uploads/1/3/0/6/130620902/rivuzifon_dalurozozexefit.pdf
    • http://administrator.raingodz.com/uploads/1/3/0/7/130776446/3138249.pdf
    • http://www.rachelmariebrennan.com/uploads/1/3/0/3/130323126/9877337.pdf
    • http://badleyenterprises.net/uploads/1/3/0/6/130622076/birokedevoleza.pdf
    • http://www.kristin-shea.com/uploads/1/3/0/7/130739463/boxafedikapizeliz.pdf
    • http://radiopalabrotas.com/uploads/1/3/0/6/130604102/4557198.pdf
    • http://gemmabrady.com/uploads/1/3/0/6/130620297/furamupoxamokoz.pdf
    • http://peaksmobile.com/uploads/1/3/0/2/130287246/zelafakanerev_lapagumekimino_wojegagapob.pdf
    • http://thomasdesign.info/uploads/1/3/0/3/130379391/3963585.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_off00008444.bin
6f2dd3fabcf028818b6b81146b13f93fc7b6c3ef1a77d60e354588f627e9103d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8444 8144 bytes

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