Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca9e1bdf2d1023b…

MALICIOUS

PDF

43.0 KB Created: 2020-09-30 20:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 807e7034a33d891fe774cf056addc0fb SHA-1: 182d722c644ccf6b2f510df02fbb2fb5e218864b SHA-256: cca9e1bdf2d1023bc7daa71f7a47ac7490153b7bb146a1dbf6da70b84b875f73
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/strik?keyword=ejemplo+de+bosquejo+de+investigacion+pdf'. This indicates an attempt to lure the user to a malicious site, likely for phishing or to download further malware. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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=ejemplo+de+bosquejo+de+investigacion+pdf In PDF document text
    • https://site-1037882.mozfiles.com/files/1037882/12217396916.pdfIn PDF document text
    • https://site-1036640.mozfiles.com/files/1036640/43839479191.pdfIn PDF document text
    • https://site-1036997.mozfiles.com/files/1036997/ririmasaxexume.pdfIn PDF document text
    • https://site-1036652.mozfiles.com/files/1036652/37172473371.pdfIn PDF document text
    • https://site-1038323.mozfiles.com/files/1038323/53580224817.pdfIn PDF document text
    • https://site-1037275.mozfiles.com/files/1037275/nezakuma.pdfIn PDF document text
    • http://nufibuv.highlifewatches.com/uploads/1/3/1/3/131380081/2860691.pdfIn PDF document text
    • http://files.midwaytacticalgear.com/uploads/1/3/2/8/132815359/6378617.pdfIn PDF document text
    • http://files.thewirld.org/uploads/1/3/0/9/130969551/33325cfee7e6.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/1/0431/0971/2021/files/keba_is_trapped_in_a_well.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6980/6494/files/altiplano_mexicano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6808/7717/files/vosapisagefotid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5387/5357/files/88997327940.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7124/2391/files/14589722641.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F73 1584 bytes
SHA-256: 6cdeb338ca0c14a838071e42115d759c134b6a0189f741aa51288927a6534fd4
font_01_sfnt_off0000677b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x677B 5736 bytes
SHA-256: da31196df8258cecab579b9e2e4c7da1eac61740fc791625e5ab6f90a7d36351
font_02_sfnt_off00007af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF5 10352 bytes
SHA-256: ee6e73567e3e5fd4490b0c6955b5a00e36bf8b66b6415081c3b13adc1dd8548a

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