Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9c129a76894cf1…

MALICIOUS

PDF

44.3 KB Created: 2020-10-31 14:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: bd3dcfc434223c30aeda445836abc3ff SHA-1: 1d881d84527abb63625633d7f0f9f6511d3b2d7e SHA-256: fd9c129a76894cf1582cbc243e1c2362087c0552cda56e9c3156987fca39f2cc
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF document acts as a link farm, containing numerous URLs that likely lead to malicious content or further infection vectors. The heuristics indicate it's designed as a lure, specifically mentioning browser installation or fake invoices, and points to known malicious redirector infrastructure. The embedded URLs suggest a social engineering attempt to trick users into downloading or executing malicious payloads.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/123?keyword=can+avast+remove+browser+hijacker In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374199/normal_5f89380a14ebd.pdfIn PDF document text
    • https://galuxenezinex.weebly.com/uploads/1/3/4/4/134437763/niwajetefivin.pdfIn PDF document text
    • https://sekojufakov.weebly.com/uploads/1/3/0/7/130776719/068586e6.pdfIn PDF document text
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/zaloze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425483/normal_5f99debec7c13.pdfIn PDF document text
    • https://rowurasivove.weebly.com/uploads/1/3/4/3/134357219/sotob.pdfIn PDF document text
    • https://mixosikopas.weebly.com/uploads/1/3/4/3/134383158/xusixus_levusut.pdfIn PDF document text
    • https://videxopefofima.weebly.com/uploads/1/3/4/1/134131768/xekelisozeboguwax.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/gexedopunolap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/15592b28-05d3-4d60-b535-329d13a61448/95868610070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f61aba-f061-4559-bbf9-b9fbd55d563a/14998074163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea74078-f929-4723-85e6-46a527000804/94555736678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc8b70e1-2a87-4c08-ac3a-f338e56d1597/39016553619.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_off00006e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6F 5344 bytes
SHA-256: 0585642796effccccf1f9e58dc5bdc840f2871f87e85cc21162f207e0ea6e5ac
font_01_sfnt_off00008089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8089 10692 bytes
SHA-256: c54fb86eb11087d637b4a6223dd5baf27459696c71584f7f92013d572a31b172

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