Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b92e7ae6245bab7…

MALICIOUS

PDF

49.2 KB Created: 2020-10-05 00:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f52ba16375f10ec52fba8af1bef3d802 SHA-1: d2d0bb368372fb5129f1badc1d15c92eb5dc9e1b SHA-256: 6b92e7ae6245bab7339f3cbec414495f09c7a06f5b781e90488a6f46988b8466
124 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though obfuscated, contains text related to educational exercises, suggesting a lure to disguise the malicious intent. The ML classifier strongly supports the malicious verdict, indicating a high likelihood of this document being used for phishing or malware distribution.

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://cctraff.ru/strik?keyword=ejercicios+monomios+y+polinomios+2o+eso+pdf+resueltos In PDF document text
    • https://site-1037135.mozfiles.com/files/1037135/87193523754.pdfIn PDF document text
    • https://site-1042938.mozfiles.com/files/1042938/witokivape.pdfIn PDF document text
    • https://site-1041079.mozfiles.com/files/1041079/foxumogadefekelosugosotew.pdfIn PDF document text
    • https://site-1038674.mozfiles.com/files/1038674/53292823818.pdfIn PDF document text
    • https://site-1037005.mozfiles.com/files/1037005/47062137276.pdfIn PDF document text
    • https://site-1037135.mozfiles.com/files/1037135/funasatodade.pdfIn PDF document text
    • https://site-1037224.mozfiles.com/files/1037224/55559701543.pdfIn PDF document text
    • https://site-1039393.mozfiles.com/files/1039393/roxum.pdfIn PDF document text
    • http://zufifob.ayodo.org/uploads/1/3/1/6/131607163/bf5a6.pdfIn PDF document text
    • http://files.rachelfoxfrazier.com/uploads/1/3/1/3/131380666/jiroxosogo.pdfIn PDF document text
    • http://files.aislingnaysmob.com/uploads/1/3/0/7/130775753/zexuwa.pdfIn PDF document text
    • http://files.louisescott-bushell.com/uploads/1/3/1/3/131379801/7389591.pdfIn PDF document text
    • http://files.alabamagirlsstate.org/uploads/1/3/0/7/130775916/xegosof-sixutawoxekad-revomamiwi.pdfIn PDF document text
    • http://files.shodacars.com/uploads/1/3/0/7/130776298/veparopuveb.pdfIn PDF document text
    • http://files.lyrikalstorm.org/uploads/1/3/1/4/131410818/574418.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68E3 5356 bytes
SHA-256: 647356617b010e25bcaab5cc2df9c8d7260c72aaf8dd46468aa8223c14235aeb
font_01_sfnt_off00007b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1F 11804 bytes
SHA-256: 2841e01ec8b0f8858d2da2ecb4511db21049c45e9074f49a423f2779a341b4b0
font_02_sfnt_off0000a09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA09C 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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