Malicious PDF — malware analysis report

Static analysis result for SHA-256 5167deb07a50170a…

MALICIOUS

PDF

35.9 KB Created: 2020-10-04 01:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 707aa187815f17d9b4de676881663ba3 SHA-1: d3eef2d0cf4e7ed4d6fee2c600073a1939389e0f SHA-256: 5167deb07a50170a8352c591e3cb1368db017700b1148d5414db67756fb8e21c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many pointing to domains flagged as redirectors or part of a link farm. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to external content, potentially for SEO manipulation or to serve malicious payloads, as evidenced by the link farm heuristic and the presence of a redirector URL.

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=manual+de+derecho+constitucional+tomo+1+pdf In PDF document text
    • https://site-1037156.mozfiles.com/files/1037156/misipufita.pdfIn PDF document text
    • https://site-1036879.mozfiles.com/files/1036879/73920900089.pdfIn PDF document text
    • https://site-1039828.mozfiles.com/files/1039828/zavebowaf.pdfIn PDF document text
    • https://site-1036926.mozfiles.com/files/1036926/38652768814.pdfIn PDF document text
    • https://site-1036816.mozfiles.com/files/1036816/lugogixenipufiluloxezemi.pdfIn PDF document text
    • http://files.jasonfaulstich.com/uploads/1/3/1/4/131482874/116109.pdfIn PDF document text
    • http://zelip.fixmyflatpack.net/uploads/1/3/1/8/131856040/1f6cf0a64fa0d5d.pdfIn PDF document text
    • http://files.menardthailand.com/uploads/1/3/0/8/130874183/bc13b.pdfIn PDF document text
    • http://pinomimin.rhodywatch.com/uploads/1/3/1/8/131857650/bexafelaxe-xadaka-rujosuvav.pdfIn PDF document text
    • http://files.freddotogo.com/uploads/1/3/0/7/130776518/xuzuba.pdfIn PDF document text
    • http://files.artofbriannakenney.com/uploads/1/3/1/3/131383541/4942731.pdfIn PDF document text
    • http://rerob.thrivedesignconsulting.ca/uploads/1/3/1/8/131856543/fadab-duxenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/3783/6710/files/how_to_make_a_hanging_indent_on_word_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3513/9477/files/epistemologies_of_ignorance_three_types.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4904/8474/files/91159853771.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5942/4665/files/9555421448.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_off00004b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B95 5452 bytes
SHA-256: b9330dcca3d18611b1cc3ae6593d99facc6b6ec3ca647071227615270cabe526
font_01_sfnt_off00005e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E06 10388 bytes
SHA-256: 202129957d7d1dc355b40b5407c04b8906177d11230c9fb0806ae4578b98ace5

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