Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c4a058eab81b1e…

MALICIOUS

PDF

52.1 KB Created: 2020-09-30 16:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 203cda31f2bce9a2fae6df264c622662 SHA-1: a8f9f648683b4daa176cb24269b73f1acfe56114 SHA-256: 87c4a058eab81b1e72259f3efbe2359e57d7465bca111b481948521eaed0a0e9
184 Risk Score

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 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.
  • 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://ggtraff.ru/strik?keyword=alcoholismo+causas+sintomas+y+tratamiento+pdf In PDF document text
    • http://japola.nicoledporter.com/uploads/1/3/1/0/131070674/vowogivorixixud_jisok.pdfIn PDF document text
    • http://files.brianpiercelaw.com/uploads/1/3/1/3/131380297/b711c88944413.pdfIn PDF document text
    • http://files.canadianroyalpurplesociety.org/uploads/1/3/1/8/131871593/padamegeke.pdfIn PDF document text
    • http://files.firstchristianwinchester.org/uploads/1/3/1/0/131071157/4799940.pdfIn PDF document text
    • https://site-1037081.mozfiles.com/files/1037081/numesitumugenojutemakiw.pdfIn PDF document text
    • https://site-1036743.mozfiles.com/files/1036743/56698800920.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bb6f2da-cd6e-4255-992d-d1935655f50a/5474317903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f065375-1270-401c-a215-f7dd11b3cebb/84263454933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94ff5fa2-7fbc-400e-93e2-de59fba7d8cc/77225403794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cfe777e-2cbf-4a51-8b7e-e5acff0d8766/xigoxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/rebovurokemosibobeni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5297/7313/files/hobbywing_esc_programing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0044/7655/files/73491780977.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_off000089d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89D1 5484 bytes
SHA-256: 2d88b41b09f36c15beb8f2b63fea5d8d46a604938c33d736fa451aa90184061f
font_01_sfnt_off00009c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C56 12244 bytes
SHA-256: 8400be7ef15293a0770ead1c03c672a9fa62e17ae0fc43a0e1a9be0f8eae754e

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