Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dc02300754ba9d…

MALICIOUS

PDF

42.2 KB Created: 2020-11-09 10:46:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4115a2d56b1eeedad5bf33c76f40665 SHA-1: 7451aeb6f29147fa78a265ae5d89e4c8ecb60d10 SHA-256: 28dc02300754ba9dbb2128f72fb6a988b40336e122ce74381bb90648b9909e9c
96 Risk Score

Malware Insights

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

The PDF document contains embedded links, including one to 'trafffi.ru', disguised as a search result. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to drive traffic to external sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?keyword=the+most+dangerous+fish+in+the+world+today
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f8751e8c190e.pdf
    • https://vixeregipidodig.weebly.com/uploads/1/3/4/5/134592438/nigexaxafib.pdf
    • https://nujusokomofevak.weebly.com/uploads/1/3/4/5/134503883/172353.pdf
    • https://cdn-cms.f-static.net/uploads/4409395/normal_5fa31fe29daeb.pdf
    • https://suvenalopevoku.weebly.com/uploads/1/3/4/5/134510495/9cdf0a5.pdf
    • https://luvatuxi.weebly.com/uploads/1/3/4/3/134321506/265a3e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tabubiselo.files.wordpress.com/2020/11/broiler_chicken_weight_chart.pdf
    • https://uploads.strikinglycdn.com/files/67cab06b-49d5-46eb-94bb-f4f4d475b408/our_lady_of_mercy_academy_park_ridge_tuition.pdf
    • https://nikibok.files.wordpress.com/2020/11/general_organic_and_biochemistry_7th_edition_test_bank.pdf
    • https://jezonixe.files.wordpress.com/2020/11/dutitanaxes.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006333.bin
b9fdbb39f46bbd9a5a522816b8580c74f92136b875e902786ba2f1935415df0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6333 5464 bytes
font_01_sfnt_off000075af.bin
c487c2b01ad6dfe7db8fe8c80b84fc99f34d31d5bc85cd1ff560c3813dcadabf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AF 11328 bytes

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