Malicious PDF — malware analysis report

Static analysis result for SHA-256 2176662cf2644a08…

MALICIOUS

PDF

49.4 KB Created: 2020-10-02 00:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f70c7d00a0697c7804e8c3ee7f7b5bd0 SHA-1: ec4740286f954b19b215dc108a78f272e654ef5f SHA-256: 2176662cf2644a081b3ff2c0ddb690fe5a52b609b242c53b9223bf7a476658c3
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URLs suggest an attempt to redirect the user to malicious content or phishing pages.

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=amplificador+con+transistores+mosfet In PDF document text
    • http://tufagozup.scbamo.com/uploads/1/3/2/7/132740764/tikuzovetuva_xirur.pdfIn PDF document text
    • http://pupejiti.bayshoreallergy.com/uploads/1/3/1/3/131380284/megesikozomudax.pdfIn PDF document text
    • http://files.mikeainscoughart.co.uk/uploads/1/3/1/6/131636995/nakawewasekoluledo.pdfIn PDF document text
    • http://nawuvop.muralsbymckell.com/uploads/1/3/1/6/131636644/2492318.pdfIn PDF document text
    • http://files.npxcasting.com/uploads/1/3/1/0/131069819/7982132.pdfIn PDF document text
    • https://site-1036725.mozfiles.com/files/1036725/wetibagejetijiguboji.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/82eff5a7-089f-414d-b6d6-d5d3ae38d756/83159499000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a132d7-92a1-42b2-bbf5-dda9846a05b6/92498887463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b485022-52c6-41a5-b9e8-6aa136975f5d/9991315076.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/0666/9212/files/kojutujaladufivelobap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/1576/5922/files/higher_boiling_point_trend.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4973/3282/files/54953393599.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_off0000836d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x836D 5288 bytes
SHA-256: f7245f4871f942098f93c6508c7c1397554c715969ec322f677bef2561008282
font_01_sfnt_off00009556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9556 10920 bytes
SHA-256: 336f5b71fa1c2ed6176a9c58637d0bbe895108cb371c0a7cd143100083b10e3a

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