Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bcf2dd30b2fb35…

MALICIOUS

PDF

44.4 KB Created: 2020-07-08 19:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 1f7f2a8cbb38532e4535255f93f202bf SHA-1: 9a8689bbd541ce86fcfb0e88fc1630c7d675e43d SHA-256: 88bcf2dd30b2fb35fdc787485f8cf117036dfd7bac26433d74b9f0a712948dc9
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a significant number of embedded links, many pointing to potentially malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure users to external sites. The presence of numerous links suggests an attempt to distribute malware or conduct phishing operations.

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://ttraff.ru/wb?keyword=pressure%20die%20casting%20defects%20pdf In PDF document text
    • http://files.jhwolfanger.com/uploads/1/3/1/8/131857818/3249006.pdfIn PDF document text
    • http://files.squareonegoodsco.com/uploads/1/3/2/8/132815154/tasawaz.pdfIn PDF document text
    • http://files.hoosiertrappersupply.com/uploads/1/3/1/8/131872285/056fbe2.pdfIn PDF document text
    • http://files.arizonalife.rocks/uploads/1/3/2/6/132681450/xufajabal_sapadu_durewalek_rulozepewi.pdfIn PDF document text
    • http://files.oleanfoodpantry.org/uploads/1/3/1/3/131384071/zapuzederadum-sogotixeroj.pdfIn PDF document text
    • http://files.techtrekfriend.com/uploads/1/3/1/1/131163932/vumowajofap.pdfIn PDF document text
    • http://files.artcollectivefrederick.com/uploads/1/3/0/8/130814237/papagupomimemodizug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wimokudijo.files.wordpress.com/2020/07/woxep.pdfIn PDF document text
    • https://daxujuga.files.wordpress.com/2020/06/zekitituxi.pdfIn PDF document text
    • https://rogafoxozi.files.wordpress.com/2020/07/47481308074.pdfIn PDF document text
    • https://dufaxuxed.files.wordpress.com/2020/06/gaxakejedudumusor.pdfIn PDF document text
    • https://vegumakelaj.files.wordpress.com/2020/06/wijemu.pdfIn PDF document text
    • https://fimesijonoba.files.wordpress.com/2020/06/kasubekuxalarat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69440205977.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bobidaxida.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasebiv.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B5 5064 bytes
SHA-256: d09d538056a400ef03272e5907fc53fbfdf9cfd800a55c0bae30becc8c934f00
font_01_sfnt_off000082f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82F6 9912 bytes
SHA-256: d9bfa27d7932d2db8ab8a8f820f8c39c558069be308013bba0ea4ed0aeed3fcc

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