Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06cef4eb53a4fe0…

MALICIOUS

PDF

42.1 KB Created: 2020-10-30 20:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 05b8ffa65866ee4ccf02380c458979ce SHA-1: 751affcb9dd72d668f22719d4509add17e3e01d7 SHA-256: a06cef4eb53a4fe0cf5eae24872d3bcefc5cbefbcf63df880018e9137ac37a11
162 Risk Score

Malware Insights

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

The PDF contains a lure related to a contract, and heuristic firings indicate it links to known malicious redirector infrastructure. The document body also contains embedded URLs, including one pointing to a malicious redirector. The ML classifier strongly flagged this PDF as malicious, suggesting a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/wb?keyword=contract%20de%20comodat%20imobil%20model%20pdf In 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/1/0432/8328/4132/files/rexipavixofusuvofibifaku.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/kimase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1410/5499/files/75877328118.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/rational_numbers_venn_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/nauka_angielskiego_chomikuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8eec7bb-2809-46ae-b0ff-d2d38a719122/52945753493.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/69117964278.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/apprendre_le_japonais_pour_dbutant.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3206/3383/files/nmap_termux_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/resiliencia_y_afrontamiento.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/physiology_of_heart_failure.pdfIn PDF document text
    • https://s3.amazonaws.com/tipakalif/simpsons_scientific_method_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/stay_hungry_stay_foolish_steve_jobs_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8475/7165/files/microsoft_project_guide.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_off00006873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6873 5168 bytes
SHA-256: 7e1b561c6c6370f11a4216cc26578766c2ac5356e9dfea9bcd25e029e735bdfa
font_01_sfnt_off000079e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79E6 10168 bytes
SHA-256: f620eab1410b3f19c1559ff990ae467b1f43a45364aa79e0be100017f8657ed1

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