Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecc60d9f15330c2…

MALICIOUS

PDF

33.5 KB Created: 2020-10-05 07:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ca89887cc72e73d6bec3e9f65e970251 SHA-1: d4fbb59c14e6be43febce493108802d9e69b10e8 SHA-256: 3ecc60d9f15330c2bb895b745d4233c2dd5b520287c583fa85f292ffb8d18ecf
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs pointing to external PDF documents hosted on various domains. The heuristic firings indicate that this is a malicious redirector and a link farm, likely intended to manipulate search engine results or distribute further malicious content. The primary URL identified is https://gettraff.ru/strik?keyword=administracion+financiera+contemporanea+r+charles+moyer+pdf, which is flagged as a known malicious redirector.

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://gettraff.ru/strik?keyword=administracion+financiera+contemporanea+r+charles+moyer+pdf In PDF document text
    • http://files.canyonrunner.com/uploads/1/3/0/7/130775654/luzolapaba.pdfIn PDF document text
    • http://baluxi.uplinkfitness.com/uploads/1/3/0/8/130813533/gufuxavugow-nabubafuzim-jedunijoke.pdfIn PDF document text
    • http://files.southlinewaterfowl.com/uploads/1/3/2/8/132815054/5827146.pdfIn PDF document text
    • http://files.davisionfilms.com/uploads/1/3/0/7/130739895/gujon_rogiz_mijeg_gegus.pdfIn PDF document text
    • https://site-1038440.mozfiles.com/files/1038440/lifoburejenilarorowope.pdfIn PDF document text
    • https://site-1041076.mozfiles.com/files/1041076/79691326357.pdfIn PDF document text
    • https://site-1038477.mozfiles.com/files/1038477/59355965941.pdfIn PDF document text
    • http://buwaxun.liquidnitrogenphoto.com/uploads/1/3/2/7/132712336/3e6f135d76c7cd.pdfIn PDF document text
    • http://files.muzictomyears.net/uploads/1/3/1/4/131483154/9006942.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/1/0482/0418/5752/files/15236154182.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5843/7530/files/zirowosiwawadiwinunonar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/9933/7127/files/71775652417.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_off000044db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44DB 5484 bytes
SHA-256: 3c74e5ae04859389e43a622acbb691052cb4ada8530a5e39011524a3ac2850ed
font_01_sfnt_off00005763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5763 9876 bytes
SHA-256: 186acdf7193d6fb9824140c41dccb63f8f88ab93abe09b29ec7ad110f794da8c

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