Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cb87bb5f98503d…

MALICIOUS

PDF

44.8 KB Created: 2020-10-03 10:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 235d21e68ad9a83032926a95099e7931 SHA-1: 6aa1cb372acf06c40346df736fe8c0f10a45cfc7 SHA-256: f2cb87bb5f98503d463fc96a2c26fcdca61482d11ee284517e1f8c877ec5edf8
132 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains URLs that are part of a link farm hosted on disposable domains, suggesting a lure to download further malicious content. 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=bad+resume+examples+word+doc In PDF document text
    • https://site-1039610.mozfiles.com/files/1039610/65947304361.pdfIn PDF document text
    • https://site-1036935.mozfiles.com/files/1036935/gebobemizetudenopu.pdfIn PDF document text
    • https://site-1036971.mozfiles.com/files/1036971/81246687398.pdfIn PDF document text
    • https://site-1040203.mozfiles.com/files/1040203/56838451028.pdfIn PDF document text
    • http://files.theoraamericanbulldogs.com/uploads/1/3/0/7/130740624/zimixoj_xomosarewuniwej.pdfIn PDF document text
    • http://files.sfka.org/uploads/1/3/0/8/130874169/7971859.pdfIn PDF document text
    • http://nedavus.allensonarmory.com/uploads/1/3/1/8/131857204/gafafet-foxafipamidun-sekovi.pdfIn PDF document text
    • https://site-1036625.mozfiles.com/files/1036625/zikipavewowenin.pdfIn PDF document text
    • https://site-1036828.mozfiles.com/files/1036828/paxeraxemu.pdfIn PDF document text
    • https://site-1037276.mozfiles.com/files/1037276/pinizadekaxolanofux.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_off000071b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B0 5428 bytes
SHA-256: 9dc56d34b87d9ad21fa545d8cd813ca74e393c3e4e45fa3de3c44ed5c4d0af3d
font_01_sfnt_off00008422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8422 10156 bytes
SHA-256: afb64c34058851ea65dbdb1467ef140fffe6913bce304fffb79264f174655228

Open this report in the interactive analyzer, or submit your own file for analysis.