Malicious PDF — malware analysis report

Static analysis result for SHA-256 160adc0b68eeabdb…

MALICIOUS

PDF

46.6 KB Created: 2020-10-08 08:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e1a7f8535915fd4ec9d5539c2d104327 SHA-1: ea2b3167d250a76e01c771f256ba6459d0c30ac8 SHA-256: 160adc0b68eeabdb5cb13e5a8b7be682407875bc98c642088dab5f847478499e
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically targeting users interested in real estate. The ML classifier strongly indicated maliciousness, and the document body, though corrupted, contains a URL pointing to a redirector. The presence of multiple disposable domains hosting PDF files suggests a link farm for SEO poisoning or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 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=real+estate+in+tbilisi In PDF document text
    • https://site-1039911.mozfiles.com/files/1039911/votemomisatilabesubazon.pdfIn PDF document text
    • https://site-1039950.mozfiles.com/files/1039950/4717791679.pdfIn PDF document text
    • https://site-1036848.mozfiles.com/files/1036848/woxarowulusot.pdfIn PDF document text
    • https://site-1043175.mozfiles.com/files/1043175/botav.pdfIn PDF document text
    • https://site-1038780.mozfiles.com/files/1038780/23613214986.pdfIn PDF document text
    • http://files.saskatchewancabinrentals.com/uploads/1/3/1/4/131482833/769868.pdfIn PDF document text
    • http://tubiwov.yaffabeautybyrica.com/uploads/1/3/1/6/131636789/tidenozojasabupafex.pdfIn PDF document text
    • http://files.attorneysocher.com/uploads/1/3/0/7/130739247/5380734.pdfIn PDF document text
    • http://files.eventsaengerin-francesca-donato.de/uploads/1/3/0/7/130739662/3206673.pdfIn PDF document text
    • http://bexumifi.escaypeent.com/uploads/1/3/1/3/131383761/niwujivez_xetejutekax_lawonido.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/18d39147-eaf3-4182-ae0d-f21a7d3f3817/nesewabudidupisabogawoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2cd871a-d493-441e-aebc-034858e06126/48929182683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b7a26f-d80f-4dc2-9030-88ac276e4678/11689511385.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_off00007a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A54 4732 bytes
SHA-256: 06c96d422472c606338bea1acaca0474babf0f318afd2647759b13fca7d85e3f
font_01_sfnt_off00008a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A81 10444 bytes
SHA-256: ce6e5016317e5215bbba3f1d2b9f4fdc28269b4727c1f52e3c422b34c7ce0315

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