Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90044943921d1e4…

MALICIOUS

PDF

33.5 KB Created: 2020-10-09 03:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3873517381cae540a750f41b3b5c39b7 SHA-1: 741c920ea45e57eb507dc7e356d1e8272422792f SHA-256: a90044943921d1e435d94c355d5511287981a1f1797ace9c90d365694ecf2a80
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to internet access and a URL that appears to be part of the malicious infrastructure. The presence of multiple links hosted on disposable domains further supports a malicious intent, likely for phishing or distributing further malware.

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://gettraff.ru/strik?keyword=in%25C3%25A9galit%25C3%25A9+acces+internet+dans+le+monde+cm2 In PDF document text
    • http://files.warbergoriginals.com/uploads/1/3/1/4/131438899/zowexukej_wovijofava.pdfIn PDF document text
    • http://files.bwellcolumbus.com/uploads/1/3/1/0/131070476/ad99038ac.pdfIn PDF document text
    • http://files.otamamarere.com/uploads/1/3/1/6/131637240/1fea91736c.pdfIn PDF document text
    • https://site-1037828.mozfiles.com/files/1037828/77451985316.pdfIn PDF document text
    • https://site-1038904.mozfiles.com/files/1038904/59982440188.pdfIn PDF document text
    • https://site-1036881.mozfiles.com/files/1036881/giwudatosomolu.pdfIn PDF document text
    • https://site-1037885.mozfiles.com/files/1037885/70079682426.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/a4cb64a1-0e06-4f38-9d33-f7925a44aaf0/gufujutezuzewimub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dceab429-4213-410a-a2ca-6118fcde0f12/pesepetufarevituxorulari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf83ee8d-8039-4151-9e20-0ab93f3fde97/57156197653.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_off0000428b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x428B 5472 bytes
SHA-256: f682b87c73d785ad66a48b5ebd14794dd9a3a6f1261302922e674c2e618fa0f0
font_01_sfnt_off000054cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54CD 10636 bytes
SHA-256: 02112a22e9e5185006f606a3df60b8aaeeb3b3c18bab0021b089e6a1738188f3

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