Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb42c6ec2e551648…

MALICIOUS

PDF

54.7 KB Created: 2020-07-08 14:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 8b710abdc9335a3c546667b2cc81ef65 SHA-1: 5e4916c112eb09c34d87397340e78a8249755e86 SHA-256: eb42c6ec2e5516481c520a9f6e28df9c5c6217015a5515a1ed3a04a4ef69acc7
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The heuristic firings indicate that the document is part of a link farm, likely for SEO poisoning or to distribute malicious content. The primary attack pattern involves luring users to click on these links, which then lead to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ttraff.cc/wb?keyword=abecedario%20ruso%20y%20espa%C3%B1ol%20pdf In PDF document text
    • http://files.brushandbranch.co/uploads/1/3/0/7/130740344/2297158.pdfIn PDF document text
    • http://files.thecrusadesports.com/uploads/1/3/1/4/131453560/75fc5bcfbe831f.pdfIn PDF document text
    • http://files.gatetocommunicate.com/uploads/1/3/1/4/131409508/8276851.pdfIn PDF document text
    • http://files.cozykidsembroidery.com/uploads/1/3/1/4/131409170/ninebafakafekip.pdfIn PDF document text
    • http://files.theblushersmanual.com/uploads/1/3/1/4/131437753/xemawativa-fizifikafibafe.pdfIn PDF document text
    • http://files.dnaleatherwa.com/uploads/1/3/0/7/130738814/8327209.pdfIn PDF document text
    • http://files.bizraeli-anglo.com/uploads/1/3/1/4/131454850/zevoka-xojasorani-niwobe.pdfIn PDF document text
    • http://files.planninginblackandwhite.com/uploads/1/3/2/7/132710655/bobuzugipiz_renele_litazafurusagop.pdfIn PDF document text
    • http://files.takakohasegawa.net/uploads/1/3/0/7/130775838/tudeniril-siwir-komewizotiki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gimasesagix.files.wordpress.com/2020/06/kigunetifapuv.pdfIn PDF document text
    • https://devukage.files.wordpress.com/2020/07/8689988516.pdfIn PDF document text
    • https://mirexudokof.files.wordpress.com/2020/06/mobitima.pdfIn PDF document text
    • https://menorolimi.files.wordpress.com/2020/06/29712372333.pdfIn PDF document text
    • https://womemoz.files.wordpress.com/2020/06/41828770245.pdfIn PDF document text
    • https://vozopowu.files.wordpress.com/2020/07/29742043878.pdfIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A81 5288 bytes
SHA-256: 2a1c34abe7139ea4e5635628443d956ff46b34cc2e10521943d43ff8d18f99ae
font_01_sfnt_off00008c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C78 22092 bytes
SHA-256: 867109226d0811832e40000c320d3bb0dd63f30c789ee02a2c87a0f469fa25f1

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