Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab37d914765a5dc…

MALICIOUS

PDF

47.9 KB Created: 2020-06-09 01:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 0c0ece5708d04b322ef530379f5ea38a SHA-1: c1e1425b5b402477d8a71727f0718d2f077c3a79 SHA-256: 4ab37d914765a5dcb1329d564ee571cb633febb5e9a4797a1cfc3b99db27a2d9
184 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with the primary URL pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the link farm and redirector strongly indicate a malicious intent to lead users to harmful sites.

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.com/wp3?keyword=crofton+bread+machine+manual#crofton+bread+machine+manual In PDF document text
    • http://wc.undesirable.us/uploads/1/3/0/4/130436181/d4e828eb0764870.pdfIn PDF document text
    • http://thtam.org/uploads/1/3/0/8/130814190/beff3868b09.pdfIn PDF document text
    • http://webdisk.lancerpep.org/uploads/1/3/1/3/131398154/3461796.pdfIn PDF document text
    • http://shopswimninja.com/uploads/1/3/0/7/130776239/b42e4fd0cf88c.pdfIn PDF document text
    • http://img-q8.com/uploads/1/3/0/6/130604010/639427.pdfIn PDF document text
    • http://mta-sts.mail.needahbasket.com/uploads/1/3/0/6/130604812/4bb44e3.pdfIn PDF document text
    • http://erkigroup.com/uploads/1/3/0/6/130639385/bexevezuzi.pdfIn PDF document text
    • http://rcdesigns-online.net/uploads/1/3/1/4/131407890/wubagixij-vakazigaj-kabemesovixifi.pdfIn PDF document text
    • http://kidlymestory.com/uploads/1/3/0/5/130540037/342810.pdfIn PDF document text
    • http://jocilynsjourneytowellness.com/uploads/1/3/0/7/130739423/litamax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fiferomuger.files.wordpress.com/2020/06/virosutogenuloriwujodopu.pdfIn PDF document text
    • https://wopigumu.files.wordpress.com/2020/06/jonapis.pdfIn PDF document text
    • https://jawajadepoj.files.wordpress.com/2020/06/84287213340.pdfIn PDF document text
    • https://nulibaxixido.files.wordpress.com/2020/06/81186845090.pdfIn PDF document text
    • https://nanajubedod.files.wordpress.com/2020/06/lubezibepepewoj.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 7

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1E 11748 bytes
SHA-256: eb0c05e8a49f09d234189f2a05c5cf5eb3a81c7edb81b6a8a9069bd42fe84578

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