Malicious PDF — malware analysis report

Static analysis result for SHA-256 583b8a19f6248eb7…

MALICIOUS

PDF

38.9 KB Created: 2020-03-10 03:24:18 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: afd23ff3948dc800557751b94721f38e SHA-1: 4ed97d20873e061adcb6ff9edd76d43ebed39dc9 SHA-256: 583b8a19f6248eb7001ce9e78ce67f3d6446e0c4bd2013ff2636eae1c282b50f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample, but the sheer volume of external links is highly suspicious and indicative of a malicious 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://wcd-khbyu3nv.mgh-r.ch/uploads/1/3/0/7/130776077/130776077.html#beda+kopi+robusta+dengan+arabica PDF link annotation
    • http://faceshieldgraphics.com/uploads/1/3/0/4/130483983/nipadugisadudoxan.pdfIn PDF document text
    • http://www.solidpieces.com/uploads/1/3/0/6/130621304/4723586.pdfIn PDF document text
    • http://contactmts.com/uploads/1/3/0/8/130874497/5713269.pdfIn PDF document text
    • http://westboro-apts.ca/uploads/1/3/0/6/130605269/sajavojerogod_vimodukidano.pdfIn PDF document text
    • http://divadollscouture.com/uploads/1/3/0/5/130589299/nagowekirewi.pdfIn PDF document text
    • http://advokat-moscow24.site/uploads/1/3/0/7/130738504/1306d17e71.pdfIn PDF document text
    • http://www.eyelashextensiontrainingmn.com/uploads/1/3/0/3/130312986/b5139d649b.pdfIn PDF document text
    • http://www.ashleycatlingtenor.co.uk/uploads/1/3/0/2/130274076/xexulilom-jifazixewilosa-sotezumej.pdfIn PDF document text
    • http://bestelectricmountainbike.com/uploads/1/3/0/4/130483741/tarijes.pdfIn PDF document text
    • http://bundukimusic.com/uploads/1/3/0/6/130639859/zenegipebalepumigi.pdfIn PDF document text
    • http://www.lasvegaspoolserviceco.com/uploads/1/3/0/2/130270798/b4917c.pdfIn PDF document text
    • http://natashastraley.com/uploads/1/3/0/4/130435717/0ff72.pdfIn PDF document text
    • http://jasonbondpumps.com/uploads/1/3/0/3/130324270/dipukine_gebaweke_sujijepibovame_vemegexet.pdfIn PDF document text
    • http://www.julietbeaute.shop/uploads/1/3/0/6/130620202/8241576.pdfIn PDF document text
    • http://borgowine.com/uploads/1/3/0/3/130313346/19f955a362f20.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70A7 7704 bytes
SHA-256: f54b942eed758cf8527d669ae882d1fd47ca23eceac09923e3b483f47b415acb