Malicious PDF — malware analysis report

Static analysis result for SHA-256 8334c59354fe8ff4…

MALICIOUS

PDF

50.4 KB Created: 2020-07-08 12:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 39c30d990739cf5333e0190852c77aab SHA-1: b6ddf058eceaad41ecba6543cfc18bec33317c01 SHA-256: 8334c59354fe8ff441f971a82dccefa5a2d36344c043afb1747a3ff44110ef26
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on various domains, indicating a link farm designed to manipulate search engine results or distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc', which is likely used to obscure the final destination of the malicious payload. The ML classifier also strongly indicated maliciousness.

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.cc/wb?keyword=clarence%20larkin%20book%20of%20daniel%20pdf In PDF document text
    • http://files.woodlandsfrenchies.com/uploads/1/3/1/3/131383553/buvomagedax_dopiriveluk.pdfIn PDF document text
    • http://files.pemmensgolf.net/uploads/1/3/1/3/131379612/febokibilodirina.pdfIn PDF document text
    • http://files.iwstreecare.com/uploads/1/3/2/7/132740479/wogupu-zukokitoruwogog-zikezugufada-pubuzesilas.pdfIn PDF document text
    • http://files.courtingkenya.com/uploads/1/3/1/8/131857818/2da98bbc.pdfIn PDF document text
    • http://files.geophysical.eu/uploads/1/3/1/4/131407263/wuzodiwomedoxisu.pdfIn PDF document text
    • http://files.gtc-elite.org/uploads/1/3/2/6/132682570/netefikuvuboz_fifajog_jubakafa.pdfIn PDF document text
    • http://files.killjoy.info/uploads/1/3/2/8/132816158/444fa6d86d0810f.pdfIn PDF document text
    • http://files.mindscapegallerystl.com/uploads/1/3/2/6/132683111/1329c.pdfIn PDF document text
    • http://files.syrcemusic.com/uploads/1/3/0/9/130969503/2378674.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://kafafawabeso511102548.files.wordpress.com/2020/06/43249485181.pdfIn PDF document text
    • https://nikuzeveda405669889.files.wordpress.com/2020/06/punuditok.pdfIn PDF document text
    • https://deporimoka.files.wordpress.com/2020/06/xibevavofumebaresonivapo.pdfIn PDF document text
    • https://bobiresa372961564.files.wordpress.com/2020/06/nepuvuwitomon.pdfIn PDF document text
    • https://turimofusi.files.wordpress.com/2020/07/5340299472.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_off00008937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8937 4908 bytes
SHA-256: 1d30c0a296b7d82cde9bd2629dfe13b3aaea1c790803581975ed700e97cf4160
font_01_sfnt_off000099e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99E0 10312 bytes
SHA-256: e2dc775f68a464b1bb5a419a1b45f290cfa20c6e58aba35c0a0b28c12f1b04f5

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