Malicious PDF — malware analysis report

Static analysis result for SHA-256 16565ea4c8d7c139…

MALICIOUS

PDF

56.5 KB Created: 2020-04-20 04:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cb196e028b458fe8e786ce8b36765be9 SHA-1: 7dc6101925ece0131b8cff8382868cb6da23650f SHA-256: 16565ea4c8d7c139e3e9c09934bb7f09f578fe8241b3fbe43648d4cc3718ee07
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to algorithmically generated URLs, indicating a link farm designed to host malicious content. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and heuristics suggest it is used to redirect users to potentially malicious websites, likely as part of a phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9778

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://thereadingplayground.com/uploads/1/3/1/4/131453354/131453354.html#old+maplestory+thief+guide
    • http://tivedstorpskulturforening.se/uploads/1/3/0/6/130621115/bevada.pdf
    • http://angela-zhao.com/uploads/1/3/0/8/130813898/8416886.pdf
    • http://homes-with-heart.com/uploads/1/3/0/2/130271219/luwileto-fisuzuvu-bomipa.pdf
    • http://modestoclimatizacaoeenergiasolar.com/uploads/1/3/0/7/130739221/kinanegomokof.pdf
    • http://txlandworks.net/uploads/1/3/1/3/131382320/nadipafuzoxo.pdf
    • http://websecurize.fr/uploads/1/3/1/3/131383763/9739081.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_off0000b3c8.bin
6597e9d29d6ab3d04af53629dfafb824174c18fefcc577fa3dcf5c670e5bf6d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C8 8708 bytes

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