Malicious PDF — malware analysis report

Static analysis result for SHA-256 c989196b4753ec20…

MALICIOUS

PDF

37.8 KB Created: 2020-07-10 10:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 8e5a88ad1713439fdce801d18a5b9871 SHA-1: b525e123a7e26041691b6bc19f9d82a695eea161 SHA-256: c989196b4753ec20d53e1e8a8d49360a50f9980ce5c6ef1a6c95f14839d37193
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/wb?keyword=present%20perfect%20simple%20and%20continuous%20pdf%20exercise'. The document body also contains this URL and numerous other PDF links, suggesting a link farm or redirection scheme designed to lead users to 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.cc/wb?keyword=present%20perfect%20simple%20and%20continuous%20pdf%20exercise In PDF document text
    • http://files.oldwakey.co.uk/uploads/1/3/2/6/132681602/ginirugikix.pdfIn PDF document text
    • http://files.yourbirth.com/uploads/1/3/0/9/130970016/zadozexetejot.pdfIn PDF document text
    • http://files.schulzeteach.com/uploads/1/3/1/3/131380341/602cd62.pdfIn PDF document text
    • http://files.meridianbodycare.com/uploads/1/3/1/8/131857193/6976761.pdfIn PDF document text
    • http://files.kaylindy.com/uploads/1/3/1/3/131398386/soxeba_purabibukabi_juzonifef_jazozizagenexu.pdfIn PDF document text
    • http://files.12monthbeauty.com/uploads/1/3/0/8/130874128/6301925.pdfIn PDF document text
    • http://files.billbrownphotog.com/uploads/1/3/1/1/131163723/6516409.pdfIn PDF document text
    • http://files.stevenlarose.com/uploads/1/3/1/3/131379353/2161474.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vegumakelaj.files.wordpress.com/2020/06/30917469329.pdfIn PDF document text
    • https://poxofozej.files.wordpress.com/2020/07/65494711575.pdfIn PDF document text
    • https://fusogigati.files.wordpress.com/2020/06/23149472854.pdfIn PDF document text
    • https://motonukem.files.wordpress.com/2020/06/62165127871.pdfIn PDF document text
    • https://ligarupature.files.wordpress.com/2020/06/75391157257.pdfIn PDF document text
    • https://vedusax.files.wordpress.com/2020/07/53440048520.pdfIn PDF document text
    • https://mifowoxar.files.wordpress.com/2020/06/wegasibenatapululinanujaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baxumedufimoval.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6735074847.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43396058945.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_off0000576f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x576F 5252 bytes
SHA-256: d9f0d3a6bd86045de49cd136fd6d8cd43776318cdd628be6d6b1b8c5182ae7b2
font_01_sfnt_off00006922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6922 9636 bytes
SHA-256: a977444936e751dacd47e03163a8da6dbbb6ba2b7e2986c356132c71eec393ea

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