Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd6ebab1fdff53d…

MALICIOUS

PDF

66.4 KB Created: 2020-10-06 18:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 99fe41a61a296c3816419fe8650ce126 SHA-1: 6e490dad93fd8bc1491ec4a73daca8148e63a718 SHA-256: 4dd6ebab1fdff53db34e3a50c109728737845d531f0458d7d00a85a540d04860
184 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous links to external websites. One prominent URL, https://ggtraff.ru/strik?keyword=esquema+multifilar+tubo+fluorescente, is flagged as a malicious redirector. The document's structure and the presence of many links suggest an attempt to manipulate search engine rankings or direct users to malicious content, aligning with SEO spam tactics.

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://ggtraff.ru/strik?keyword=esquema+multifilar+tubo+fluorescente In PDF document text
    • http://ripovud.timsguitar.net/uploads/1/3/1/3/131378898/gamus-sedexopusomuzap.pdfIn PDF document text
    • http://files.miraculousloveinternational.org/uploads/1/3/2/7/132712102/49eb15633.pdfIn PDF document text
    • http://figapope.walcotchurch.co.uk/uploads/1/3/1/4/131406202/9001610.pdfIn PDF document text
    • http://xopapomor.grantbomberbarker.com/uploads/1/3/1/4/131407253/6627452.pdfIn PDF document text
    • http://misopix.toaelectronicsusa.com/uploads/1/3/0/7/130775403/2403343.pdfIn PDF document text
    • https://site-1043119.mozfiles.com/files/1043119/kuwifokopidadifivaj.pdfIn PDF document text
    • https://site-1042666.mozfiles.com/files/1042666/moletijalodoze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3099d24b-1575-4ba1-9c45-257fb567207c/fukideri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5260588-0e00-47ae-9347-6773da1173c2/remekixepavulaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da592a7-7098-4707-9f35-9eefd3b576ff/23998778621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed8c9b3-4268-4c69-b774-cd14d221ff51/95220452557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d38f02c6-5e6d-4c0f-a134-7f5f73430979/68294951266.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/84478814015.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/1194/7926/files/17237709688.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0360/0283/files/medidas_de_tendencia_central_definicion.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C5A 5132 bytes
SHA-256: 17f6edee682dd4b3431e8bf365590e60ca50ee4d03252f43b2175bf4f10db248
font_01_sfnt_off0000adb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB2 13528 bytes
SHA-256: 18cc22f45c92c673103817414bca1984a81b8048022018edc133180fbe5e569c
font_02_sfnt_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 16080 bytes
SHA-256: b0deecbfe9503f8e1956f768ce99028e18d7de30c43ed8f39a60d8175b81601b
font_03_sfnt_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c