Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc38b2d914d2b83c…

MALICIOUS

PDF

72.4 KB Created: 2020-10-06 15:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 6179e47751e1d9dfc21c026ed760cb34 SHA-1: fef37d1005010a9d3e0414db2c722a625400cd8f SHA-256: cc38b2d914d2b83c3876b737e3b511828f40fbb3496ccc2e15c77cdb2c4ee8c8
192 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=human+karyotyping+gizmo+worksheet+answers In PDF document text
    • http://files.oaasis.info/uploads/1/3/1/4/131408029/9656625.pdfIn PDF document text
    • http://files.aldendieselandtractorrepair.com/uploads/1/3/1/6/131637255/2790132.pdfIn PDF document text
    • http://files.mantasosguide.com/uploads/1/3/1/0/131070378/winorepotaxudaze.pdfIn PDF document text
    • http://jabiziw.missdavisluellalions.com/uploads/1/3/1/3/131398453/rifafukanezajuzumi.pdfIn PDF document text
    • http://fativaze.cupboardunderthestairsmedia.com/uploads/1/3/1/6/131606552/879402.pdfIn PDF document text
    • http://files.millersairsupply.com/uploads/1/3/0/7/130775952/d0b735f652ca.pdfIn PDF document text
    • http://files.stjohnsepiscopalchurch.org/uploads/1/3/2/3/132303068/minixuv.pdfIn PDF document text
    • http://files.rccwood.com/uploads/1/3/1/3/131379590/xagurenepojuw.pdfIn PDF document text
    • http://files.mirgwilliam-parkes.com/uploads/1/3/1/4/131438694/gixivixe-vovunemiv-dugome-noxovumupubede.pdfIn PDF document text
    • http://fosizu.newahecevents.org/uploads/1/3/0/8/130873937/788673.pdfIn PDF document text
    • http://files.fanuna.com/uploads/1/3/1/3/131379320/jizoso.pdfIn PDF document text
    • http://files.lavieenblanc.net/uploads/1/3/0/9/130969370/5717703.pdfIn PDF document text
    • http://paxile.pattyspetalsgodfrey.com/uploads/1/3/2/8/132814343/vumirodazisoj.pdfIn PDF document text
    • http://files.stclaircountydems.com/uploads/1/3/1/4/131406234/f2ffae3e2963.pdfIn PDF document text
    • http://suweki.john3ministries.org/uploads/1/3/2/7/132741136/falebafeverali_gateminamonor.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_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 5468 bytes
SHA-256: b0d3223acb619f26c0fb86fd64438349112eca582d87565d9780c5e3081d3556
font_01_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 9980 bytes
SHA-256: f84826872bed2b3dc5d56862db1408de13083f785e84f8c8afd7604d0d217fa7