Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1fc71afff3d371…

MALICIOUS

PDF

39.6 KB Created: 2020-10-09 14:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 34a6f0e0396cd6b03d50d43dfae7de5f SHA-1: 9e23596aed6544322ecdc7a1d92f00ff3ced884d SHA-256: bc1fc71afff3d37161634f43585ca0792ada244a36245aa627895d4a96a50c0a
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 external PDF files hosted on disposable domains, indicating a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a potential phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL analysis strongly suggest a malicious intent to redirect users to harmful 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=como+sobrevivir+en+el+desierto+de+noche In PDF document text
    • https://site-1036981.mozfiles.com/files/1036981/vavoziwi.pdfIn PDF document text
    • https://site-1039210.mozfiles.com/files/1039210/92429151219.pdfIn PDF document text
    • https://site-1039577.mozfiles.com/files/1039577/buzareruxam.pdfIn PDF document text
    • https://site-1037235.mozfiles.com/files/1037235/pawiwozuvuvofezake.pdfIn PDF document text
    • http://kaguwis.store.easy-editor.com/uploads/1/3/1/6/131606666/ganuzu_sajiguxomuxif_pumulujofi.pdfIn PDF document text
    • http://files.thelastbaguette.com/uploads/1/3/1/4/131407709/dobut.pdfIn PDF document text
    • http://jodun.elizabethfeltsdesign.com/uploads/1/3/1/3/131381241/jelifutujisapij.pdfIn PDF document text
    • http://files.academyofequestrianarts.com/uploads/1/3/2/6/132695438/5277884.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/1/0438/2566/0066/files/debuwemexejokusa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0090/5380/files/55612321470.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4584/6168/files/65782678918.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_off00005c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C72 5076 bytes
SHA-256: 8ec350143683e4e072487cda353c7db064b53634df9d3751f6d6a5bdada7a456
font_01_sfnt_off00006d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D86 10740 bytes
SHA-256: a907b686c347e508f5f5703c0969fb5419e7dfa5af60a7d29ae987f89e6b2d97

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