Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca39e3abb6504c9…

MALICIOUS

PDF

46.3 KB Created: 2020-10-07 05:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b2847d6209b3bd43443b0c3b2f16fb3c SHA-1: f4437153ff7271581a7b9be15a39f87a92a5edc1 SHA-256: 3ca39e3abb6504c9309a52fcd6de05aa1ad37411925fc40bd7e5cc33b735a883
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, and the document's structure suggests it's a link farm designed to lure users to potentially harmful sites. The embedded URL 'https://gettraff.ru/strik?keyword=instrumentos+de+evaluacion+frida+diaz+barriga' is a primary indicator of this malicious intent.

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://gettraff.ru/strik?keyword=instrumentos+de+evaluacion+frida+diaz+barriga In PDF document text
    • https://site-1043172.mozfiles.com/files/1043172/89439795423.pdfIn PDF document text
    • https://site-1036858.mozfiles.com/files/1036858/vexisadetexerelij.pdfIn PDF document text
    • https://site-1040250.mozfiles.com/files/1040250/zofefipexanomawiza.pdfIn PDF document text
    • https://site-1044209.mozfiles.com/files/1044209/10660646470.pdfIn PDF document text
    • http://files.cicelynelson.com/uploads/1/3/0/7/130775393/sapatubepifere-fejipelezup-jemevewifukubix.pdfIn PDF document text
    • http://fubej.airhabbo.com/uploads/1/3/1/4/131437849/gakujaxobebikat-boleveg.pdfIn PDF document text
    • http://files.futura-foundation.co.uk/uploads/1/3/0/7/130740597/2607851.pdfIn PDF document text
    • http://files.superdiscountwigs.com/uploads/1/3/1/4/131437584/2108760.pdfIn PDF document text
    • http://files.accruemineralsinc.com/uploads/1/3/1/6/131636886/a97fee0b6b2.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/3573c2c1-52b8-4bd4-bf8a-c96af2ec4329/22229142082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87df1489-3540-4e4a-b16a-8df852d9f661/91349183023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14f5bf06-734d-4713-b69d-6ddf07078c5f/8225400637.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6909/3541/files/the_clearfield_doctrine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3219/4453/files/fadepadaguwajof.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_off00007107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7107 5528 bytes
SHA-256: 9c550c356cb40cf2a10fd3088d5444b2dd4c586e89b1e02a8e4aa35276b4bcd1
font_01_sfnt_off000083cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83CB 11896 bytes
SHA-256: 3812ccaa4d1c16b2727518bd8641aad79cba39c2131e6118ea12e2f767d873c3

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