Malicious PDF — malware analysis report

Static analysis result for SHA-256 657680cd971f2d33…

MALICIOUS

PDF

37.9 KB Created: 2020-10-09 00:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 8e1dd9b13506331e017aa4fb4d8a7653 SHA-1: d899985543b6e67cfbbb2c09c63ea59a349e99fb SHA-256: 657680cd971f2d3355cc4cf497081a4ac32a6a7b319ebc0ba66d445d2e5e91a8
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://gettraff.ru/strik?keyword=cross+stitch+alphabet+template In PDF document text
    • http://gufes.phoenixassociates.com/uploads/1/3/0/8/130814297/2767293.pdfIn PDF document text
    • http://files.cassandracyril.com/uploads/1/3/0/8/130813554/mewelogigemuno.pdfIn PDF document text
    • http://lalalib.missiontruespirit.org/uploads/1/3/1/3/131384613/9319510.pdfIn PDF document text
    • http://files.side-hustle-plr.com/uploads/1/3/1/8/131857580/0ea1494c833c042.pdfIn PDF document text
    • https://site-1039478.mozfiles.com/files/1039478/lerakifugokezadumu.pdfIn PDF document text
    • https://site-1042672.mozfiles.com/files/1042672/maxujawasenujaruvokuwakub.pdfIn PDF document text
    • https://site-1038427.mozfiles.com/files/1038427/nojiteni.pdfIn PDF document text
    • https://site-1037920.mozfiles.com/files/1037920/zaralususunazipi.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/1/0463/0701/6866/files/haynes_auto_repair_manuals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af17df10-94d2-4af6-9edf-a5b6022a891a/sajozozarafelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ecc1c8d-c4fe-4f26-8e45-a08cb0fb2967/36903165472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9617a63-704e-4da0-a015-9b3dcc4c5584/26325281882.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_off00005757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5757 5220 bytes
SHA-256: 0f8b07ba7b5bf722ff4ee9129162a4214ffaa85d9e21cc6c3c85b428b7be92df
font_01_sfnt_off000068e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68E6 9996 bytes
SHA-256: b1074b42ccc4962c5c6551c51d7508f717a8b53b4eb511d43e8ea0a1d719ef8b