Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31e282ea30037ba…

MALICIOUS

PDF

39.7 KB Created: 2020-04-11 07:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c4d08166709f427aa93c32e9cf762bfe SHA-1: 18ad2db079bb3d370b225093829e4ea7d6c7a8d9 SHA-256: a31e282ea30037baf9d3b2de2c219c95027d3dbc89ff87cfcf4f79623f7357cb
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs are likely used to distribute further malicious content or for SEO spamming purposes.

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://mindforyou.org/uploads/1/3/0/2/130271209/130271209.html#black+lotus+stygian
    • http://customuv.com/uploads/1/3/0/2/130271139/denozakabawi.pdf
    • http://tonychristelleducational.org/uploads/1/3/0/8/130874681/f7505f925476.pdf
    • http://35andunder.com/uploads/1/3/1/4/131483167/xedepigonikarixovep.pdf
    • http://mannysjewelrybox.org/uploads/1/3/0/6/130604815/jadaganikep.pdf
    • http://americanizada.com/uploads/1/3/0/5/130539899/vomoguwetixixaf_wofix.pdf
    • http://taitscapes.net/uploads/1/3/0/4/130435857/3632626.pdf
    • http://cmmellc.com/uploads/1/3/0/5/130551049/telijuzat.pdf
    • http://webdisk.prettynpoised.com/uploads/1/3/0/5/130540106/4066743.pdf
    • http://airtechops.com/uploads/1/3/0/5/130545537/ririkud-boziwanog.pdf
    • http://macksbabybook.com/uploads/1/3/0/6/130604350/batoxulobedebeve.pdf
    • http://youdrivemetodrink.com/uploads/1/3/1/1/131163691/tozazilamu.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_off0000733d.bin
1e26e9a55c5813ea80c9a44322862bbace8d71a5b1d5be222e6ec1fea9656396		 pdf-font-stream PDF embedded font (sfnt) at offset 0x733D 7872 bytes

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