Malicious PDF — malware analysis report

Static analysis result for SHA-256 134e2e3d645ffe4e…

MALICIOUS

PDF

50.5 KB Created: 2020-10-08 11:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f22b8f7abe17408b565f76b5645fa329 SHA-1: 6b3ab7df08fae2740af41584262b523e879a9562 SHA-256: 134e2e3d645ffe4ea7881bcd8f4ced96f33a678a9ffdea30e1e9432651eeb22c
124 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 heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK'. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the PDF is designed to trick users into visiting a compromised site, likely for further exploitation or credential harvesting.

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=collagen+structure+and+mechanics+pdf In PDF document text
    • http://files.operaunlimited.org.uk/uploads/1/3/0/7/130739938/jurarodogefavi_fefusolefikabud_dozatopiwu.pdfIn PDF document text
    • http://kixodu.theloveafter.com/uploads/1/3/1/3/131398003/satobuwolenisis_jabobubodaropiv_nejegowenawipog.pdfIn PDF document text
    • http://files.upperwoodacademy.org/uploads/1/3/0/8/130874379/5508010.pdfIn PDF document text
    • http://files.lightsoutbaltimore.org/uploads/1/3/1/4/131408798/kuvuk.pdfIn PDF document text
    • http://files.polohouston.com/uploads/1/3/1/4/131453989/lolomusari-zekerikomaduru-sapalitavuzer-gegugutokid.pdfIn PDF document text
    • http://files.soldiersofchrist.net/uploads/1/3/0/8/130813692/4387766.pdfIn PDF document text
    • http://files.polarisportfolios.com/uploads/1/3/1/0/131071056/powamigolu-kewoso.pdfIn PDF document text
    • https://site-1037157.mozfiles.com/files/1037157/dipeteva.pdfIn PDF document text
    • https://site-1038597.mozfiles.com/files/1038597/zivuliwepuxewov.pdfIn PDF document text
    • https://site-1041608.mozfiles.com/files/1041608/galurazumuposojun.pdfIn PDF document text
    • https://site-1039900.mozfiles.com/files/1039900/tapidikinatatito.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8851/3691/files/aquabot_turbo_t2_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8085/7253/files/chos_global_natural_farming.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_off00007e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E8F 5476 bytes
SHA-256: 5d2b60202dca92cfa3a9c939ab3f64c55103ab39211474eead0151e2a05fd6ed
font_01_sfnt_off000090fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90FC 13820 bytes
SHA-256: abde27dc6e824115c05b6506e90b6c6c61a1ace5951b143d88a1647af1223b72

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