Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed76f175452b05bf…

MALICIOUS

PDF

42.1 KB Created: 2020-03-29 08:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e856767f3c263119f9f88646508096b4 SHA-1: 98f31f9cffc81f46c0d1389ab5d9511655a1bd31 SHA-256: ed76f175452b05bf4583ac8aca210329c5f810d563348a26132a26820954ffe3
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to domains that appear to be part of a link farm. The document body, though partially corrupted, suggests a lure related to children's activities. The primary intent appears to be directing users to a network of potentially malicious websites, as indicated by the PDF_SEO_LINK_FARM heuristic and the numerous embedded URLs.

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://qualitycareafh.com/uploads/1/3/1/4/131437919/131437919.html#actividades+lectura+infantil+5+a%C3%B1os
    • http://nowthenfuture.com/uploads/1/3/0/4/130436244/3498974.pdf
    • http://www.emberunderground.com/uploads/1/3/0/5/130539841/baxobar-ligezigevusuta-dilibibak-julofosalevijo.pdf
    • http://storywrecker.net/uploads/1/3/0/8/130874395/f50ea9e66ffd.pdf
    • http://smartchoiceagentswi.com/uploads/1/3/0/4/130478160/5377905.pdf
    • http://atyourservicepetgrooming.com/uploads/1/3/0/5/130588809/7517343.pdf
    • http://datattorney.com/uploads/1/3/0/5/130588816/766b1c977c037e.pdf
    • http://sarahstrasser.net/uploads/1/3/0/3/130379651/xadesetulofufo.pdf
    • http://www.obyhousetellers.com/uploads/1/3/0/5/130589150/4558595.pdf
    • http://jessicasipe.com/uploads/1/3/0/7/130775398/tuzatisawed.pdf
    • http://maulamm.com/uploads/1/3/0/6/130620979/ximojefuzujeko.pdf
    • http://www.shanamstruble.com/uploads/1/3/0/9/130969915/2727581.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c4f.bin
3f2859cd160346eadad38a7ecb50057a4bbe54b09497f18b5055779c22cf9e21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4F 9932 bytes
font_01_sfnt_off00008f3f.bin
e4f0d88a11a57b550a6bf3d2f407f5090be555efbd5e03bb78db6d6fa7e4f4aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3F 2748 bytes

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