Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffa5d9842a9c599…

MALICIOUS

PDF

40.6 KB Created: 2020-04-06 11:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 24468e7d288d0d5cbf0e7815e14e99c6 SHA-1: f1a15d9b7c2a6fadc54a3108c20562bec09bfdff SHA-256: 1ffa5d9842a9c599813b8e3f20ad494adc176d8333ab016eecafd3fcff219c05
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though partially garbled, contains text related to 'Artes plasticas en educacion preescolar' and metadata from wkhtmltopdf, suggesting it was generated programmatically to host these links. The primary attack pattern involves directing users to a network of suspicious domains.

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://peanutgalleryphotography14.com/uploads/1/3/0/9/130968913/130968913.html#artes+plasticas+en+educacion+preescolar
    • http://router.gtrnet.com/uploads/1/3/0/7/130776344/0bd8eb2a9.pdf
    • http://annkellettghostwriting.com/uploads/1/3/1/4/131408620/zaminitalugarujet.pdf
    • http://experienceearth.store/uploads/1/3/0/5/130551832/tadimabafo_bikiki_gutifis.pdf
    • http://midsouthsmallbusiness.info/uploads/1/3/0/9/130969369/gidiliwu-tulonalajakiva-wofigidube-jurilegalana.pdf
    • http://scarydinostudio.com/uploads/1/3/0/3/130313006/b34406a6477722.pdf
    • http://contabilizeja.com/uploads/1/3/1/3/131379899/wivufuzomokujoz-begajuxer.pdf
    • http://openworktelecom.net/uploads/1/3/1/3/131381048/7332674.pdf
    • http://iblockgroup.com/uploads/1/3/0/9/130969695/3f6a65340ecdac.pdf
    • http://cascadestherapy.com/uploads/1/3/0/6/130603874/pazexuzijupos.pdf
    • http://meresoft.net/uploads/1/3/0/6/130621622/7784818.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_off000074fe.bin
78786939a94901032daf234a454293749da7a5593e65e55622349f0ddfee9546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FE 8472 bytes

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