Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05c33d199cac184…

MALICIOUS

PDF

34.6 KB Created: 2020-11-09 11:23:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8a2fd74062766d91ef292414707fe6fa SHA-1: b3761b017ea5976d74379a579c6ebf505c5c5699 SHA-256: e05c33d199cac184a7718e2396335335dd1221b7a08d8c161aa02f3df7ced633
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to S3 buckets, which is characteristic of a link farm designed to manipulate search engine rankings. One of the primary URLs, 'https://trafffe.ru/aws?keyword=eureka+boss+vacuum+bags+upright', appears to be the main lure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to drive traffic to external sites.

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://trafffe.ru/aws?keyword=eureka+boss+vacuum+bags+upright PDF link annotation
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/napemowepub_sarideraled_mebak_vamiw.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/mamakugigejot_kawuwofilunexe.pdfIn PDF document text
    • https://buxijoxusezo.weebly.com/uploads/1/3/1/4/131483018/1593344.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/6921392.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/radio_shack_weather_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/41123018669.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/dshs_bremerton_washington_phone_number.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/sirapeneripoxovu.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/ravovowamakukopi.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/bunnies_and_burrows.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/sadokiwomulegazuxup.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/reproduction_vocabulary_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/abidjan_map.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_off00004504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4504 5536 bytes
SHA-256: 450576ed67295f1e9c4b731b431b8a1019bd6b85ce2caf789a1abf9087371b08
font_01_sfnt_off000057b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57B9 10712 bytes
SHA-256: 917591cd22f8b9e9446840339538be2a900dc81d76f97c8c6ae516683ec0b951

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