Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5260fa3bf27267c…

MALICIOUS

PDF

36.6 KB Created: 2020-04-01 12:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 70b5c1a2b9cc60d4e3fe8103eda79eec SHA-1: bb77d231a6284a1ea0ad5e41615741349a03abc1 SHA-256: a5260fa3bf27267cefc0d95def4e5a1bab107979fa05474b2acd8082c80f782a
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 pointing to various domains, indicating a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior. The embedded URLs are likely used to drive traffic to these sites, potentially for advertising fraud or to host further malicious content. No scripts were extracted from this sample.

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://myindependentkids.com/uploads/1/3/1/3/131379356/131379356.html#para+que+sirven+las+preguntas+de+investigacion+pdf PDF link annotation
    • http://crowdrising-success.com/uploads/1/3/0/6/130620691/7083347.pdfIn PDF document text
    • http://bcpsllc.com/uploads/1/3/0/8/130814112/6ff8a59f1.pdfIn PDF document text
    • http://100hunts.com/uploads/1/3/0/2/130287936/a74a71e4f.pdfIn PDF document text
    • http://ssjrconsulting.com/uploads/1/3/0/9/130969311/b8eca0ed46b.pdfIn PDF document text
    • http://moorheadcrush.com/uploads/1/3/0/6/130604986/5505537.pdfIn PDF document text
    • http://corazonz.com/uploads/1/3/0/2/130270955/2886293.pdfIn PDF document text
    • http://annejacobsonmusicstudio.com/uploads/1/3/0/5/130543488/pisop-gofidebawer-busugigewotad-kapezaz.pdfIn PDF document text
    • http://wildlife-cameraman.com/uploads/1/3/0/6/130620987/luxix.pdfIn PDF document text
    • http://absolutewater.net/uploads/1/3/0/5/130540874/xevibax.pdfIn PDF document text
    • http://theimpracticalguitarist.com/uploads/1/3/0/4/130483895/fulexonag.pdfIn PDF document text
    • http://msdocumentaries.org/uploads/1/3/0/6/130605387/wakabumapavupab.pdfIn PDF document text
    • http://lindseymaloneart.com/uploads/1/3/1/3/131384229/8103518.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_off000064b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B8 8376 bytes
SHA-256: ca84d4ac566a06df11c4d10b36d1935a35ee49e89d068b0c0efc861407bc82ca