Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcce734c68936470…

MALICIOUS

PDF

46.1 KB Created: 2020-04-05 02:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 209381aff72bdaf84a127518c1304e2c SHA-1: 7bf12d4b661766f5c9ef661598e17c135a852d3e SHA-256: fcce734c68936470c12b2beea70fa276813cf34bef6ba7d7bf7950c518b7e04b
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, a technique often used for SEO poisoning or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'polipos endometriales' and references the wkhtmltopdf generator, suggesting a lure document. The primary attack pattern involves directing users to a network of SEO-optimized PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://blindtigerbarberco.com/uploads/1/3/0/9/130969546/130969546.html#que+son+los+polipos+endometriales
    • http://mdhippies.com/uploads/1/3/0/2/130289521/pefisane_diloviva.pdf
    • http://moonbahridgemorgans.com/uploads/1/3/0/7/130740200/sefumeva_mobum_vozulejememu_forabazabalal.pdf
    • http://radiotrompetafinal.net/uploads/1/3/0/2/130287988/7223262.pdf
    • http://howeclean.co/uploads/1/3/0/3/130379408/logemirome.pdf
    • http://vantumcanada.com/uploads/1/3/1/3/131383823/nagowedokozo.pdf
    • http://perfecttimingboutique.com/uploads/1/3/1/1/131164562/2785162.pdf
    • http://encouragemyself.com/uploads/1/3/0/3/130324092/romovusa.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_off000089db.bin
cb4a0c615c930fd5157f64c8e8f2267dfbe82e9b50cea3f59d0174b01a754f87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89DB 9372 bytes

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