Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac38dbb4477a6ea…

MALICIOUS

PDF

49.6 KB Created: 2020-10-30 06:23:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: be33fe8f04f19a7e423eb349f79b96e8 SHA-1: 355b82ea21ccdd47537e3044bd172e65f30ddb47 SHA-256: 7ac38dbb4477a6ead2cbc935603ee0ae784bf42011a047545895d7ba9431dfd2
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised with text related to "Cheesecake factory server test answers". The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm used for SEO manipulation or distributing malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of embedded URLs and the link farm strongly suggest a phishing or redirection attack.

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://gettraff.ru/aws?keyword=cheesecake+factory+server+test+answers In PDF document text
    • https://xemupawiked.weebly.com/uploads/1/3/4/3/134321325/basemesurumi.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/popazugame.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/7904132.pdfIn PDF document text
    • https://juzugimigiroteg.weebly.com/uploads/1/3/2/3/132302883/affd96fc6f7.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/bomuxiditofik_sajig.pdfIn PDF document text
    • https://sopodepewujo.weebly.com/uploads/1/3/4/3/134340903/bc0069c704639.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/1/0434/3939/0872/files/xawulo.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/certificado_medico_secretaria_de_salud.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/oxigeno_disuelto_en_aguas_residuales.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2335/4021/files/tomed.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/61931611755.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5512/6949/files/biotransformation_of_xenobiotics_detoxification.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9461/5226/files/effects_of_imperialism_in_africa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4479/6078/files/44040530951.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/17005503650.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/25904831166.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_off0000828f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x828F 5160 bytes
SHA-256: 2962ce3342bef5ba202bf49c16df3862a913b9b874d107d88974676e2da024d8
font_01_sfnt_off00009430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9430 11044 bytes
SHA-256: 11e5aa3c353b5cc6c5b99c89c1375066c690042f03c927412dcff42761d107d2

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