Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c30782343454f3…

MALICIOUS

PDF

34.7 KB Created: 2020-07-08 14:39:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: a4c3dfb70edbdbb2714f17e3bbe616ae SHA-1: 723135a7a14aa9c1108075b8e273ca93081a0eb8 SHA-256: 41c30782343454f3fb7da1620fb96787365112b4650d11c798b50a62af4aae3c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of embedded URLs, many of which point to link farms designed to manipulate search engine results. One critical heuristic firing indicates a PDF redirector link to 'https://ttraff.ru/wp3?keyword=walk+in+the+woods+book+pdf', which is known malicious infrastructure. The document body also contains this URL and numerous other PDF links, suggesting a lure to download further malicious content. No scripts were extracted from this sample.

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/wp3?keyword=walk+in+the+woods+book+pdf In PDF document text
    • http://files.bishopgumbleton.com/uploads/1/3/1/3/131379371/tokasinipegog.pdfIn PDF document text
    • http://files.myollimaattacollection.com/uploads/1/3/1/3/131384573/35c66ee9fd.pdfIn PDF document text
    • http://files.neilmckenzieyouthfishingcontest.org/uploads/1/3/1/6/131606127/1963708.pdfIn PDF document text
    • http://files.yogashak.com/uploads/1/3/0/9/130969910/zevuru.pdfIn PDF document text
    • http://files.theeaglegallery.com/uploads/1/3/1/4/131406295/sosopula.pdfIn PDF document text
    • http://files.bangalowclinicalpsychology.com.au/uploads/1/3/0/7/130776514/5342185.pdfIn PDF document text
    • http://files.alexcrumpillustration.com/uploads/1/3/0/9/130969532/sizozelev-patufoto-janijaf-xeweserif.pdfIn PDF document text
    • http://files.bluenosewoodworks.com/uploads/1/3/2/8/132815961/somokirolurujewikusi.pdfIn PDF document text
    • http://files.villa-anggrek.com/uploads/1/3/1/3/131379371/difisudenaborex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://nizunivatam.files.wordpress.com/2020/07/76915321777.pdfIn PDF document text
    • https://kepedizav.files.wordpress.com/2020/06/furomekilej.pdfIn PDF document text
    • https://gorajeg.files.wordpress.com/2020/06/10948380599.pdfIn PDF document text
    • https://fojesezowivi.files.wordpress.com/2020/06/62562449181.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_off00004af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF5 5132 bytes
SHA-256: b788a61bd387f93ed0c4e0351e0fb89e145b60c1c28989f0a1ed596cc5e7ed53
font_01_sfnt_off00005c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C75 10044 bytes
SHA-256: 41d987dff8df1b79a6ceec5bf8dc6b661ea94a62cb4c976484c6a3e57695b84a

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