Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8256fa880cb9c48…

MALICIOUS

PDF

85.9 KB Created: 2020-12-28 06:01:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5886a3b540c86612bac5ae8044e49553 SHA-1: f8024e93f12689a421acc9ad696b13560f83695b SHA-256: a8256fa880cb9c48117f4fc771eab8f709ab8ffaee6cef69a32e126440292ca9
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files, indicating a link farm or redirection scheme. The primary link directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the structure suggests an attempt to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://traffmen.ru/strik?utm_term=miniature+pigs+as+pets+pros+and+cons In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5f89196e548ea.pdfIn PDF document text
    • https://jelosixonov.weebly.com/uploads/1/3/4/6/134666827/piwanipis-lifile-kemedarevuzozu.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/wqHAjdM/horror_games_2019_granny.pdfIn PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/e27909d0be.pdfIn PDF document text
    • https://sozetodu.weebly.com/uploads/1/3/4/2/134265488/195cab92bd15.pdfIn PDF document text
    • https://cdn.sqhk.co/devurekon/2hiLhca/xuvazutow.pdfIn PDF document text
    • https://cdn.sqhk.co/dunenilufa/fU5jhii/38025094367.pdfIn PDF document text
    • https://cdn.sqhk.co/vixonafom/eQhe5ge/awesome_games_cowboy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_5faa506a2f4da.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesiwafo/jhCJ7ib/lg_xboom_go_pl5_precio.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/bodipedopura.pdfIn PDF document text
    • https://paviliwele.weebly.com/uploads/1/3/4/4/134489687/33cb602.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/jekjbia/halloween_2020_cancelled.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D5 5212 bytes
SHA-256: 71ba0ab939c93b34a15d8760cac4098e1a8849befc5c85a265e34ae52205e650
font_01_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 11168 bytes
SHA-256: fdb75cf64df28f6f840d0a9083269a68a5671a9c9687d2b62e6edee1b119cf0c

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