Malicious PDF — malware analysis report

Static analysis result for SHA-256 990246c89275dda7…

MALICIOUS

PDF

41.3 KB Created: 2020-03-24 04:10:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 102931b8d9d779612d538d089e5005c9 SHA-1: 9e33e91e656041ac07d11960c1be2c1c11272406 SHA-256: 990246c89275dda79bd106b5e4d5d3dfe1304f03310f4683af938496dc5a9861
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links pointing to other PDFs hosted on various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of SEO-optimized PDF files, likely for malicious purposes such as distributing further malware or engaging in click fraud. 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://inlandcbd.com/uploads/1/3/0/6/130639236/130639236.html#bible+meaning+of+numbers+365
    • http://wonderful-morocco.com/uploads/1/3/0/6/130603903/kedofokufelafesi.pdf
    • http://www.thewowfam.com/uploads/1/3/0/4/130483564/tewapiwaraziguto.pdf
    • http://thismaycomeinhandy.com/uploads/1/3/0/7/130739264/818762.pdf
    • http://www.merakiins.com/uploads/1/3/0/9/130969080/e990ffb1a.pdf
    • http://nhgahplgsresidency.com/uploads/1/3/0/6/130604048/4668965.pdf
    • http://thechocolatemoosesc.shop/uploads/1/3/0/5/130539004/8689332.pdf
    • http://mergny.be/uploads/1/3/0/6/130620709/bixiviwof-loropomasova-lomabuf-dafuvexamopuzi.pdf
    • http://swearsandstares.com/uploads/1/3/0/5/130550848/pibar_wagilefobu.pdf
    • http://nancymaldonado.com/uploads/1/3/0/7/130776698/kopuvilap.pdf
    • http://loganscup.com/uploads/1/3/0/3/130379237/pojilir_koziziw.pdf
    • http://mdcurbside.net/uploads/1/3/0/7/130740056/gimefisavebowixof.pdf
    • http://nhindependentvoters.org/uploads/1/3/0/5/130551106/5914544.pdf
    • http://hawthornere.com/uploads/1/3/0/7/130776898/tegizedikazupo_jomasaxezotoxo_dajonu_vemejipafuxad.pdf
    • http://voiceyour.love/uploads/1/3/0/5/130543285/873103.pdf
    • http://dentalpeoriaaz.com/uploads/1/3/0/5/130545745/54238c.pdf
    • http://do-what-works.net/uploads/1/3/0/7/130739152/1088902.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_off00007a39.bin
d49c271c0cdd3a135dde846526aff7c3b91ecbaa79476f6e195863d15d16ce3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A39 7684 bytes

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