Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78bb3a8020827ce…

MALICIOUS

PDF

41.0 KB Created: 2020-08-07 22:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a98a20e993f8914464865596fb05826 SHA-1: ae73d05b362b645e138c6270752d812ca23bbb65 SHA-256: e78bb3a8020827cece81481de70cf9d577159fd5cf65e14d6d3b331d5ac45043
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external sites, indicating a link farm or redirection strategy. The primary malicious URL identified is https://ttraff.ru/pify?keyword=acta+constitutiva+de+una+sociedad+cooperativa+formato+pdf, which is flagged as a known malicious redirector. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the document body itself contains embedded URLs, reinforcing the attack pattern.

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 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.
  • 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://ttraff.ru/pify?keyword=acta+constitutiva+de+una+sociedad+cooperativa+formato+pdf
    • http://files.caterpillarcorner.org/uploads/1/3/1/1/131164351/fujori-todixu-kolegipidisu.pdf
    • http://files.creativecounselingsrq.org/uploads/1/3/1/4/131438024/goxexobek.pdf
    • http://files.ennitolkki.com/uploads/1/3/1/3/131381900/sukenelake.pdf
    • http://files.drugcrisisinourbackyard.org/uploads/1/3/1/4/131453106/mezomolumuzadodo.pdf
    • http://files.heritageecc.com.au/uploads/1/3/1/3/131384468/a2ac09ae953e3.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/94651103506.pdf
    • https://cdn.shopify.com/s/files/1/0435/4375/6954/files/62362793215.pdf
    • https://cdn.shopify.com/s/files/1/0430/7009/5521/files/59942269680.pdf
    • https://cdn.shopify.com/s/files/1/0433/6012/5080/files/tewevemodamujoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/tozenuxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3305/0779/files/25810488249.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/xolawimurofixit.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/pupagek.pdf
    • https://cdn.shopify.com/s/files/1/0435/0171/5622/files/storey_building_plans.pdf
    • https://cdn.shopify.com/s/files/1/0431/0777/8711/files/tuxuzemulimoza.pdf
    • https://cdn.shopify.com/s/files/1/0437/3141/9287/files/16583442897.pdf
    • https://cdn.shopify.com/s/files/1/0432/2515/3698/files/indonesia_visa_application_form_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006149.bin
ace2fa27e8f6b90f21ab79707742389fbc50ebb1a8d99d208e64a18ece851dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6149 5316 bytes
font_01_sfnt_off00007351.bin
121c7b26c398dca50866b239a9c31bf21fcb0b79245a59cd13e10612cacd1f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7351 10304 bytes

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