Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2700b6d7c15b4d…

MALICIOUS

PDF

72.8 KB Created: 2020-09-29 23:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e11d913cb14f7bb486fd190ee699f4bf SHA-1: 60dc61702eea28e737bf27e981501e2a172ccaad SHA-256: 1c2700b6d7c15b4d2ddf08ca575f78622a629b31334437d53a88beb8b37f52a6
124 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://cctraff.ru/strik?keyword=ajcc+8+breast+cancer+staging+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain this same URL, suggesting the primary purpose is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=ajcc+8+breast+cancer+staging+pdf In PDF document text
    • https://site-1036951.mozfiles.com/files/1036951/mebifiv.pdfIn PDF document text
    • https://site-1037235.mozfiles.com/files/1037235/38003339575.pdfIn PDF document text
    • https://site-1036909.mozfiles.com/files/1036909/taranuxinomape.pdfIn PDF document text
    • http://files.eriechapmanfoundation.net/uploads/1/3/1/8/131859993/diberuwenufupe-vidijekoziwazok-zawovupudadexi.pdfIn PDF document text
    • http://xagil.standardpoodleforsale.com/uploads/1/3/1/4/131408738/4a44a172b.pdfIn PDF document text
    • http://files.jordantaxserviceinc.com/uploads/1/3/2/6/132681665/wejuderu-melifibo-kezotofosituguz.pdfIn PDF document text
    • http://nometovi.elirakuka.com/uploads/1/3/1/6/131636627/3643134.pdfIn PDF document text
    • http://suwogutu.fivesonsnaturescapes.com/uploads/1/3/1/4/131453336/xemuz-jawaridemonimo.pdfIn PDF document text
    • http://files.tandemmom.com/uploads/1/3/0/7/130776518/6255870.pdfIn PDF document text
    • http://files.taohandpan.com/uploads/1/3/1/4/131454304/varoponem_tiresepuza_vovixe_riviz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6c579807-7761-476d-a94f-262629fd82e3/88276740769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383da350-64b0-436d-b34b-888af8da740a/jefovibaliz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46a92f5c-b088-4c05-968f-b0393238e088/99462568598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba0161cf-c41b-491a-8ca9-e4f2c29796c9/goxufalepaxej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c554e76f-1571-4ba4-93ed-28a7a2fa08b3/35889224667.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FF 5368 bytes
SHA-256: c2d965d414ebf597cd0266eae542602fd05803e60b8069699e61cc944c1418eb
font_01_sfnt_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 10764 bytes
SHA-256: b6afcab76d81c16e1ce9f5d1a8d6046074c2ebbc93575d8fd575f8310d834db1
font_02_sfnt_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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