Malicious PDF — malware analysis report

Static analysis result for SHA-256 645ab81359ad0214…

MALICIOUS

PDF

42.2 KB Created: 2020-11-08 14:07:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: aead5713a22e9079a714cfd6da5618d8 SHA-1: 78016abb9752067fa683d7ca452910cdab3c9f12 SHA-256: 645ab81359ad0214cc12e0fd51604e858d81c6504ddab56d953bf87fa0cd110c
184 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier as malicious and contains a significant number of external links, many pointing to disposable hosting. One of the embedded URLs, https://ggtraff.ru/123?keyword=character+list+in+son+by+lois+lowry, is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other PDF links, suggesting a link farm or redirection scheme.

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://ggtraff.ru/123?keyword=character+list+in+son+by+lois+lowry In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390661/normal_5f9c1ccddea95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_5fa3cfffa7384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421460/normal_5f9d981fbcc72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/46855979256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb134be8-3d3e-4735-a13b-6bc9da6b0f31/nuwiwepunetuzi.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/21745179840.pdfIn PDF document text
    • https://mijogegum.files.wordpress.com/2020/11/bomubus.pdfIn PDF document text
    • https://meniluw.files.wordpress.com/2020/11/voxezekipufejitopewuginov.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/gopiv.pdfIn PDF document text
    • https://tevarew.files.wordpress.com/2020/11/88608638079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f586d463-4b55-4eb2-a553-6c3512f2e0cb/losumurudivo.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/8625666511.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/dabidixawiselagi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6823 5128 bytes
SHA-256: 5bc5f0b46c0f47d430710c39d6f9395d78e4d6da45413372a6dcbb2a82c29186
font_01_sfnt_off0000799c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x799C 10088 bytes
SHA-256: 640427229820e7dde211803cfb57576abff465ba36e33c1acd7593f0d1c6d910

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