Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21eda3c5304b557…

MALICIOUS

PDF

43.2 KB Created: 2020-10-03 10:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 26cc84c5145c04726815acee3b06a6a9 SHA-1: 7c428b6d64b459954a7983cfc41b2dd6e267d452 SHA-256: b21eda3c5304b5576ad252ef6762a6f8cfc32cedcbccc72fe5158cd571338d15
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, constituting a link farm. One of these links, https://cctraff.ru/strik?keyword=meso+g1+relic+farm, is identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of numerous links to external PDFs on disposable hosting further supports a malicious intent, likely to distribute further malware or engage in phishing. 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://cctraff.ru/strik?keyword=meso+g1+relic+farm In PDF document text
    • http://ridajabo.myrtlebeachsportsevents.com/uploads/1/3/1/4/131410007/460554.pdfIn PDF document text
    • http://files.sprucephilly.com/uploads/1/3/2/8/132814119/9dcf53e8f29b.pdfIn PDF document text
    • http://fodexa.perchancetheatre.com/uploads/1/3/1/3/131384600/a803713e2fb1d8.pdfIn PDF document text
    • http://baduvov.jacquelinecutler.com/uploads/1/3/0/8/130814229/76e426f43da.pdfIn PDF document text
    • http://files.ketsup-pinoy.com/uploads/1/3/2/6/132696174/fogemomuku_kezuwir_lowivomar.pdfIn PDF document text
    • https://site-1038703.mozfiles.com/files/1038703/55063619144.pdfIn PDF document text
    • https://site-1039735.mozfiles.com/files/1039735/xixediradelisazuxupeb.pdfIn PDF document text
    • https://site-1038432.mozfiles.com/files/1038432/31033270595.pdfIn PDF document text
    • https://site-1036734.mozfiles.com/files/1036734/fubika.pdfIn PDF document text
    • https://site-1037175.mozfiles.com/files/1037175/mowetimurolirugarejonix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9449/9743/files/zudifimuwisimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f519c68-7139-4e14-a576-b3175034deb3/pakuputipuzogigibuteb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/694b6524-2ba6-42e7-b49d-dd04dbb9ea5e/siwalinasupujuz.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B16 5256 bytes
SHA-256: 7e5a777cf9015566fcb951f7c1a9b731c21e8bb6023f18af8d23c1d5b17c8383
font_01_sfnt_off00007cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF8 10376 bytes
SHA-256: abddd24d8a56f48b97249f7e370ecad585467d55a94f04ccab1d3af02af34f1f

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