Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ded8612b941ee54…

MALICIOUS

PDF

40.1 KB Created: 2020-09-30 11:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e8d4ebb2502d722fa14c0e52d676403f SHA-1: d504286da066ee3d592b84c2c3751718f24357a9 SHA-256: 4ded8612b941ee549cf42567638367818e54806e33d3eecbb0afa4ed7ed6f703
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches one of the identified IOCs. The presence of numerous external links suggests a link farm or redirection scheme designed to lead users to malicious content.

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=capability+development+framework+pdf In PDF document text
    • https://site-1036874.mozfiles.com/files/1036874/21873873939.pdfIn PDF document text
    • https://site-1037228.mozfiles.com/files/1037228/72177997571.pdfIn PDF document text
    • https://site-1038429.mozfiles.com/files/1038429/ferefijupapog.pdfIn PDF document text
    • https://site-1036759.mozfiles.com/files/1036759/90062809568.pdfIn PDF document text
    • http://pisalo.ljhfoc.com/uploads/1/3/1/0/131070089/xebujimuludexuw_divonokirifulo_netozo.pdfIn PDF document text
    • http://files.rainylae.com/uploads/1/3/2/6/132680998/batixik.pdfIn PDF document text
    • http://files.tryoungcrew144.com/uploads/1/3/1/3/131378771/gajebirakafepidaja.pdfIn PDF document text
    • http://guzijo.iache.org/uploads/1/3/2/6/132680949/3536830.pdfIn PDF document text
    • http://files.pccinscape.com/uploads/1/3/0/7/130776887/386fa0.pdfIn PDF document text
    • https://site-1038940.mozfiles.com/files/1038940/diwawilizizuviponuwurazil.pdfIn PDF document text
    • https://site-1036671.mozfiles.com/files/1036671/65599322826.pdfIn PDF document text
    • https://site-1037125.mozfiles.com/files/1037125/67755528228.pdfIn PDF document text
    • https://site-1037224.mozfiles.com/files/1037224/94198895935.pdfIn PDF document text
    • https://site-1037071.mozfiles.com/files/1037071/52670912363.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005fe0.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005fe0.bin)
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/working_staffordshire_bull_terrier_breeders.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 extracted file (font_00_sfnt_off00005fe0.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE0 5372 bytes
SHA-256: 364a7d004d3e3b8456d3e2150174097d2f3b7336ceedd9feedd180c556460e48
font_01_sfnt_off00007227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7227 9804 bytes
SHA-256: 04c61e97f70ee7f841a55a50f5c57f909a5e2bf30a9e9e79a62dad583031944b

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