Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d7cb1f3cea582d…

MALICIOUS

PDF

64.1 KB Created: 2020-07-09 16:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 67b745ca41c638fe5e4887a0d8b1bd1f SHA-1: 196d68c92a786a277788b92c03193bf1ed8a7ddf SHA-256: 63d7cb1f3cea582dc0d27fcd20a0ad0069cf294eace1f55a2bc489e7e441a2ca
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external PDF files hosted on various domains, many of which appear to be disposable or part of a link farm. One URL, https://ttraff.ru/wb?keyword=minsk%20agreement%20pdf, is identified as a known malicious redirector. This suggests the document is designed to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wb?keyword=minsk%20agreement%20pdf In PDF document text
    • http://files.hornsbyptsa.org/uploads/1/3/1/3/131379434/bomujakurufilo.pdfIn PDF document text
    • http://files.lafayetteschoolrestoration.com/uploads/1/3/1/3/131398357/nutuva.pdfIn PDF document text
    • http://files.rabbitmountainlavender.com/uploads/1/3/0/7/130738625/futevukumuj_lulamatix_libujuferebetux.pdfIn PDF document text
    • http://files.flindersroom4u.com/uploads/1/3/1/8/131857071/37bce30db9.pdfIn PDF document text
    • http://files.gardereinitiative.org/uploads/1/3/0/7/130775856/8794139.pdfIn PDF document text
    • http://files.spotlightseniorservicesnorthernarizona.com/uploads/1/3/0/8/130813409/b5d2688cbaae7c.pdfIn PDF document text
    • http://files.almeria-estates-and-realty.com/uploads/1/3/1/4/131437351/fefozo.pdfIn PDF document text
    • http://files.gsskids.org/uploads/1/3/0/8/130873973/korunavo.pdfIn PDF document text
    • http://files.savebozeman.org/uploads/1/3/1/4/131408529/80336d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://naxuxeva.files.wordpress.com/2020/07/jisifife.pdfIn PDF document text
    • https://banisozix.files.wordpress.com/2020/06/zugogum.pdfIn PDF document text
    • https://masinufonowo.files.wordpress.com/2020/07/xeporelolop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fupibi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nakawefefaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gowavofopinesifaremoka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefiwi.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_off0000bf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9A 5076 bytes
SHA-256: 66840fa53b7a4c775e20c138fea1e762e4f649b424ac21a96e9502866bbac4df
font_01_sfnt_off0000d0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C0 10240 bytes
SHA-256: 3b675327fbf7e3841058900e08135e9fd7eb0b36a2439c2ca0c6980efdf9a610