Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7a043c46c47d07…

MALICIOUS

PDF

39.0 KB Created: 2020-10-30 21:57:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e57577fa776b202efd240ee830b62754 SHA-1: 585ebcd87a84a66537935f85bc976c71ae89a278 SHA-256: 8a7a043c46c47d07e538e47239301dde512b15719666a9416ef853127cd19f90
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to suspicious or unknown domains, indicating a link farm designed to redirect users to malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, and the ML classifier strongly flagged the document as malicious. The embedded URLs suggest an attempt to lure users to phishing or malware distribution sites.

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://cctraff.ru/aws?keyword=business+management+certificate In PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/bamadekob_gujonifatujura_bobeguminevoma_razalo.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/068843758a79.pdfIn PDF document text
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/pekamo.pdfIn PDF document text
    • https://xewurilarigifu.weebly.com/uploads/1/3/4/2/134236076/fimatizaz.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/ratekol.pdfIn PDF document text
    • https://luleloneluso.weebly.com/uploads/1/3/4/4/134450102/vebeg.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/7fde262bb4b.pdfIn PDF document text
    • https://xitemexum.weebly.com/uploads/1/3/4/3/134311382/69fa2ac0.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/9829973.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/1/0499/7890/0640/files/jawaxibakixuzuluso.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/tokyo_jr_subway_map.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/69508034231.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9886/4800/files/example_of_concurrent_powers_in_a_sentence.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/gafusisapu.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/boundaries_in_dating_making_dating_work.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/modelo_de_calidad_malcolm_baldrige.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_off000058e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58E6 5216 bytes
SHA-256: 2af62eebdc3878bb349109e61dcebd3000e9706c31d4c4a7354bfa44871ad304
font_01_sfnt_off00006a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A94 10696 bytes
SHA-256: 6d910b0fadedfc39374c444377968204aaf311fbe381fc11be1e4ed5310828ff

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