Malicious PDF — malware analysis report

Static analysis result for SHA-256 75eae4e657dea112…

MALICIOUS

PDF

53.2 KB Created: 2020-04-11 03:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e99f1eefae1aafd79a8297063e0d9f4a SHA-1: 0bd7f4a6934781d12523e172be18a3d1317d2576 SHA-256: 75eae4e657dea112270ba20193f7d43f251b69d6c0b810d56a4472b5135e3d57
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, many of which appear to be part of a link farm designed to manipulate search engine results. The document body, though heavily obfuscated, contains a reference to 'Fei long street fighter 5' and a URL that mirrors this, suggesting a lure to a fake game-related page. The presence of multiple PDF links and the ML classifier's high confidence score indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://misssoutheastpageantry.us/uploads/1/3/0/6/130639126/130639126.html#fei+long+street+fighter+5
    • http://justskies.com/uploads/1/3/0/6/130639368/1910292.pdf
    • http://chasingsunrises.net/uploads/1/3/0/2/130272094/fugijuwasufimizer.pdf
    • http://ustagepro.com/uploads/1/3/1/3/131398024/xejufubokixetexaf.pdf
    • http://minigypsyhorse.com/uploads/1/3/0/2/130270912/1214022.pdf
    • http://the-sustainables.org/uploads/1/3/1/4/131438024/dorin_vudojamexi_biwilekoxirided.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089a4.bin
d735e72e2b374766455c74413b0746152fb56429c15557935b5f04292a3372bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A4 8080 bytes
font_01_sfnt_off0000a8c9.bin
4798fc7b0151e9a3a2ce1976605565667daddd5a90d0479062493590d2532470		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8C9 9948 bytes

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