Malicious PDF — malware analysis report

Static analysis result for SHA-256 868bdad6379441b4…

MALICIOUS

PDF

35.4 KB Created: 2020-05-02 14:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d6f5be4ac4556e5c23984307be537668 SHA-1: 0a75305c830fa769602255e49719203f4ccbca1d SHA-256: 868bdad6379441b4052dfa10b49936418129ba8d98697889ea8846a7958933c5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO abuse. The document body contains a URL that appears to be a lure for 'hungry shark hack apk house'. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a malicious intent to redirect users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://blacktreelofts.com/uploads/1/3/0/4/130478163/130478163.html#hungry+shark+hack+apk+house
    • http://hannahbwellness.com/uploads/1/3/1/0/131070705/wenunugeziza.pdf
    • http://patricesblingbling.com/uploads/1/3/1/4/131483254/4308596.pdf
    • http://sharptopzfieldservices.com/uploads/1/3/0/3/130323491/1680860.pdf
    • http://odor911.com/uploads/1/3/0/6/130622111/wunafabinoja.pdf
    • http://baycolorsrefinishing.com/uploads/1/3/0/7/130739530/4636545.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_off000064d6.bin
d6d8ff4f6e317a3b66850054794af5d202bcf03ebb711cccc40633e2ffddec1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D6 7672 bytes

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