Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6934600cfed829…

MALICIOUS

PDF

130.9 KB Created: 2020-10-02 08:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 821db17c1ea1676f744bbcdb99d27ed5 SHA-1: d94bbbf4447af14ddc7bf7164017430d9a0c0276 SHA-256: 7f6934600cfed8297588aaedae1eb5c42e546733025f367b6629b41cb5c2d425
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to manipulate search engine results. One prominent URL, 'https://ggtraff.ru/strik?keyword=aristotle+the+nicomachean+ethics+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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/strik?keyword=aristotle+the+nicomachean+ethics+pdf In PDF document text
    • https://site-1039280.mozfiles.com/files/1039280/34869271147.pdfIn PDF document text
    • https://site-1037276.mozfiles.com/files/1037276/50174889064.pdfIn PDF document text
    • https://site-1038868.mozfiles.com/files/1038868/sikebumafi.pdfIn PDF document text
    • https://site-1036649.mozfiles.com/files/1036649/nepisivukixanibabawupis.pdfIn PDF document text
    • https://site-1038703.mozfiles.com/files/1038703/wezobafob.pdfIn PDF document text
    • http://xiboxif.pekinbible.org/uploads/1/3/1/1/131164250/jodisigivitug.pdfIn PDF document text
    • https://site-1037157.mozfiles.com/files/1037157/77487133832.pdfIn PDF document text
    • https://site-1039329.mozfiles.com/files/1039329/45410836079.pdfIn PDF document text
    • https://site-1036678.mozfiles.com/files/1036678/xoxufefuzimipiripifo.pdfIn PDF document text
    • https://site-1036835.mozfiles.com/files/1036835/62037150331.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/52be8c7b-83a9-4b79-96d5-80636fb29b73/kujiduparimexekavesefof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efe4c858-aa10-4e2e-9abf-610da72aa7ea/71184305953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ce923c1-2a99-47b2-978a-54d9528eafdd/janif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc7a2a16-e799-484d-a6aa-27ce0f815069/sizobasedofebine.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_off0001b690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B690 5384 bytes
SHA-256: a16ffba1da82a34379cb331d182d06f68cd3169ed98e27fa65b4d56e63b023b1
font_01_sfnt_off0001c8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8B4 20196 bytes
SHA-256: 8ed46001221d4e7f5540f1d2a9287b48efcdb8d17a7ce07160ec78d7d4169753

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