Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce16853949995ac…

MALICIOUS

PDF

43.8 KB Created: 2020-05-04 23:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 304374f5e272268ec12c6b9ed61880d3 SHA-1: 490a4665128ce5492510589594cc479640a407c1 SHA-256: 2ce16853949995accf00d27d35f8b64b8a8999e23fb5bf61a6e40e9d281df79c
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be SEO-optimized with numeric slugs, indicating a link farm or spamming operation. The ML classifier strongly flagged this PDF as malicious. The primary intent appears to be directing users to a network of potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://grupoforrajeroxalos.net/uploads/1/3/0/4/130476203/130476203.html#oscam+ipk+openatv
    • http://adlservicesarl.com/uploads/1/3/0/6/130639518/farajuz.pdf
    • http://jwreptiles.com/uploads/1/3/0/4/130490643/taluterelilipoxuzamu.pdf
    • http://thert66xtracts.com/uploads/1/3/0/6/130639690/rogopimadibuvego.pdf
    • http://nostalgicsigncompany.com/uploads/1/3/1/1/131163514/niwarobirofire.pdf
    • http://thermifly.com/uploads/1/3/0/4/130435500/7877988.pdf
    • http://singularleatherwallet.com/uploads/1/3/1/0/131070852/64405dbcdf1f.pdf
    • http://bronxcbt.com/uploads/1/3/0/9/130969597/kelup-boxowaloluvikox-tuzodu.pdf
    • http://xtationpv.com/uploads/1/3/1/3/131379844/4901664.pdf
    • http://nostalgicsigncompany.com/uploads/1/3/1/1/131163514/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00007b4e.bin
aa08d6ba932f882645ba89ccfcd3947f0dd85f75ebe99401715ed46d7af698e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4E 12896 bytes

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