Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba23c6b905e36106…

MALICIOUS

PDF

37.0 KB Created: 2020-09-30 14:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 47f44542cf54ab0aceca18bc113c35a0 SHA-1: 5da31818987676c9cbd6c1c89cd8834cf49608f9 SHA-256: ba23c6b905e361062b93ef64f9f458bb0bcca5e9e250743491ee03a1ebfd440a
124 Risk Score

Malware Insights

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

The PDF contains embedded links that mimic search results for a PDF to Word converter, directing users to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the document body itself contains the malicious URL. This suggests a phishing or scam attempt designed to redirect users to potentially harmful content.

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=descargar+convertir+de+pdf+a+word+gratis+en+espa%25C3%25B1ol In PDF document text
    • https://site-1037003.mozfiles.com/files/1037003/34580777378.pdfIn PDF document text
    • https://site-1036861.mozfiles.com/files/1036861/darepab.pdfIn PDF document text
    • https://site-1037009.mozfiles.com/files/1037009/xizekezexubovi.pdfIn PDF document text
    • https://site-1036644.mozfiles.com/files/1036644/4724192314.pdfIn PDF document text
    • https://site-1037115.mozfiles.com/files/1037115/bufetigirizivewi.pdfIn PDF document text
    • http://muroxenoz.divineingodministries.com/uploads/1/3/1/4/131482975/988a5302c7.pdfIn PDF document text
    • http://files.thepurposedathlete.com/uploads/1/3/1/4/131438330/1676827.pdfIn PDF document text
    • http://tijux.myremio.com/uploads/1/3/1/4/131452836/sedifitep_savuxorum_sugedugogifom.pdfIn PDF document text
    • https://site-1037011.mozfiles.com/files/1037011/xokolesitozobopi.pdfIn PDF document text
    • https://site-1036879.mozfiles.com/files/1036879/73920900089.pdfIn PDF document text
    • https://site-1037176.mozfiles.com/files/1037176/89868610648.pdfIn PDF document text
    • https://site-1036850.mozfiles.com/files/1036850/7159853755.pdfIn PDF document text
    • https://site-1037135.mozfiles.com/files/1037135/87193523754.pdfIn PDF document text
    • https://site-1037124.mozfiles.com/files/1037124/padupezilunani.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00004e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E31 5688 bytes
SHA-256: cc4d3cff590081896b04841056b2999ecd10b7e4d25b568176877316fba93a57
font_01_sfnt_off0000617d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x617D 10692 bytes
SHA-256: 89e7f82166d24563db1b3aa9c1e8fc1eb2dfe77e0dc96a0a99a3fbdfac2bb5df

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