Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d50be24cdf56f19…

MALICIOUS

PDF

40.5 KB Created: 2020-10-04 23:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d5f8c313d3e41e52b5e77d3880eaa849 SHA-1: 24c427ca12b93e61b84fed4f0e6f6f113fe82867 SHA-256: 2d50be24cdf56f19ff01103adac75103631085ac262f3f58d94f7ef2e7ba1c01
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which appear to be part of a link farm. One of the primary links directs to a known malicious redirector infrastructure. This suggests the document's purpose is to manipulate search engine results or distribute malicious content via these linked PDFs.

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=indian+caste+system+worksheet+answer In PDF document text
    • http://files.montanoslandscaping.com/uploads/1/3/2/6/132695392/xutewegediwejew.pdfIn PDF document text
    • http://files.everettqualitylandscaping.com/uploads/1/3/0/9/130969659/6686444.pdfIn PDF document text
    • http://fopom.bridgeportcf.org/uploads/1/3/1/8/131871787/1802088.pdfIn PDF document text
    • http://zedumo.mrsmljohnson.com/uploads/1/3/1/3/131383330/pizozosusetiwimevedo.pdfIn PDF document text
    • http://lemeg.verdeyvr.shop/uploads/1/3/0/8/130815137/553bed25844ac1.pdfIn PDF document text
    • http://files.oakridgearena.co.uk/uploads/1/3/0/7/130775002/dc8fe5e4.pdfIn PDF document text
    • http://files.drjamesworling.net/uploads/1/3/1/4/131411600/tanubi_paxekipar_vazidafimumof_gewokowodamu.pdfIn PDF document text
    • http://files.expresspeace.com/uploads/1/3/1/4/131409236/lodepudezimupu-xogemunad-fajojorefa.pdfIn PDF document text
    • http://files.longbeachrental.ca/uploads/1/3/1/6/131606273/jozuxu.pdfIn PDF document text
    • https://site-1036918.mozfiles.com/files/1036918/disarulazaliletozik.pdfIn PDF document text
    • https://site-1042941.mozfiles.com/files/1042941/92321810212.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/1/0496/2100/8548/files/1010400210.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2780/6883/files/najogefib.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_off000060f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F5 5344 bytes
SHA-256: bda5783eb1fe0ce8878f7c704ee9121e070df53b0954311eb19b0b12aa62febf
font_01_sfnt_off0000730a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x730A 9900 bytes
SHA-256: ccfc2bee81c4faae7960ebdca0dbb115cf699163df90d3aa65db9145f887e061

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