Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59acdd538495f79…

MALICIOUS

PDF

43.7 KB Created: 2020-08-07 22:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4a707ff0baae1fd0f72ef2557204549f SHA-1: 56c7c42b498783514e36b6f04fad554b83c5b4c7 SHA-256: f59acdd538495f79319ecaa2949e5bcab784751c10f326afa2f7709f23aa0d56
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 as a sales performance book. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded link is the primary indicator of malicious intent.

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=livro+alta+performance+em+vendas+pdf In PDF document text
    • http://files.davidschagun.com/uploads/1/3/1/4/131408970/sedos_xobovajito_lagadaw.pdfIn PDF document text
    • http://files.dos-beachwear.com/uploads/1/3/1/4/131454116/sibuvovulavidiwej.pdfIn PDF document text
    • http://files.cramericonstruction.com/uploads/1/3/1/3/131378993/wajoromerubel-waxiwuwugukuli.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/1/0431/2757/0596/files/solving_quadratic_equations_mixed_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/20555938999.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/dieta_para_varices_esofagicas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1740/3549/files/75273748314.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/74519243342.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9520/3745/files/suwakonesojapegusuwixosag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4089/7174/files/18160640223.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/jifixako.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3228/9178/files/perpendicular_bisector_worksheet_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7689/5388/files/91111702432.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1415/9521/files/53018175244.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/tibidududagija.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5453/0709/files/wameridewukunonutagikitu.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_off00006688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6688 5304 bytes
SHA-256: 9c7318016eeb14cc2d46f2b88ae623623fc17610e770f158971c5002dcd94050
font_01_sfnt_off00007885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7885 13184 bytes
SHA-256: 1ead8a90f54a70fddcb75f19a48269853f6454cedd7ab817c988f0821f792f1c

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