Malicious PDF — malware analysis report

Static analysis result for SHA-256 4951d66fe0493c23…

MALICIOUS

PDF

53.3 KB Created: 2020-11-02 07:58:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0e266385c37b42e5e6b04cbb4213332e SHA-1: 8d30be418116f01f619b16cc16516f3c4d68f926 SHA-256: 4951d66fe0493c23c84e5dee4b3b65b399d1a3c3012d40e2c60599e3a65ed268
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/123?keyword=123movies+thor+ragnarok+480hd In PDF document text
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/756c3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5f8925f2287d0.pdfIn PDF document text
    • https://vinemexip.weebly.com/uploads/1/3/4/3/134306635/436ff15a.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/pejajofedaxevaw_kozadesupuke.pdfIn PDF document text
    • https://gikowotezura.weebly.com/uploads/1/3/4/4/134493608/16d83776.pdfIn PDF document text
    • https://kawigijutugin.weebly.com/uploads/1/3/4/3/134351661/bd37c9fad05.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/911415.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/19adae050.pdfIn PDF document text
    • https://rokejowavati.weebly.com/uploads/1/3/4/2/134265467/8527212.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/9342940.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/pajokoruzerilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_5f922b014fc5b.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/23b6ea05-4519-416d-8a88-afaa99ddc7e4/66523781445.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f954fa-e05c-46f6-b4a4-d507fa6af65a/jabejitijokopunirus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/708f2d7a-f439-4dba-b8a1-5621563a4d61/79519825858.pdfIn PDF document text
    • https://s3.amazonaws.com/waxejajinigafu/mcdonalds_brand_guidelines.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_off000069ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69FF 3920 bytes
SHA-256: ae8a2210895758cb9a2ab2e3e1ec518cc80a565869465c78a174f689aa5301eb
font_01_sfnt_off000077cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77CD 6008 bytes
SHA-256: 54df4e3309f838779b8bb3461dda9577d34c41683fa83033fede751b6b46ea2f
font_02_sfnt_off00008c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1C 11544 bytes
SHA-256: 2ad2353a162cfd9daf0be0a47f2bf23ec26f1b9932ce30a42ef48bf8137cce75
font_03_sfnt_off0000b244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB244 16240 bytes
SHA-256: d048c994de8676bf725ef07c827d919816bc562664efa54bd7c5792f1dc9ea0f