Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c823cab2117c29…

MALICIOUS

PDF

40.9 KB Created: 2020-10-12 04:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 59ec51479acdad9a074833aa8628f822 SHA-1: f3c2ce8995879638c3673b23d9c026e8a1d416d3 SHA-256: c9c823cab2117c2967445c11b3729804c9c9dfa8fe302d9aeec9069f9da12cf3
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to appear as a property tax refund notification. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms that the primary URL leads to known malicious redirector infrastructure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which are likely part of a link farm designed to improve search engine ranking for malicious content. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/pify?keyword=isanti+county+property+tax+refund In PDF document text
    • https://site-1039313.mozfiles.com/files/1039313/bijujesikadopivajixe.pdfIn PDF document text
    • https://site-1036941.mozfiles.com/files/1036941/wukuguluxezeguwojave.pdfIn PDF document text
    • https://site-1036783.mozfiles.com/files/1036783/39756782080.pdfIn PDF document text
    • https://site-1036767.mozfiles.com/files/1036767/5329099822.pdfIn PDF document text
    • http://files.greatergoodconsultantsct.com/uploads/1/3/0/7/130775905/nuxenipirelonus_luzanefe.pdfIn PDF document text
    • http://files.wanbha01.com/uploads/1/3/0/7/130739488/netoz.pdfIn PDF document text
    • http://toratat.mountedup.com/uploads/1/3/0/7/130775923/2d1bfac7828f487.pdfIn PDF document text
    • http://files.sweetelegance.ca/uploads/1/3/2/8/132814136/55ba38d0d722.pdfIn PDF document text
    • https://site-1038794.mozfiles.com/files/1038794/10684366518.pdfIn PDF document text
    • https://site-1041690.mozfiles.com/files/1041690/nosero.pdfIn PDF document text
    • https://site-1038573.mozfiles.com/files/1038573/kuropixam.pdfIn PDF document text
    • https://site-1041858.mozfiles.com/files/1041858/76801276740.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0493/3894/1599/files/90015742249.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5173/5448/files/ancient_chinese_music_facts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2412/1495/files/tedd_arnold_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5833/1300/files/buy_here_pay_here_cars_albany_ny.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1744/5793/files/multiply_and_divide_rational_expressions_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5431 5108 bytes
SHA-256: 70499a8bf2ef2a26f0e72e61c8dcae2618764537b6eb7ac2347cf94cd49debfd
font_01_sfnt_off0000659c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x659C 10100 bytes
SHA-256: d90565c588d3991503c9c78704f64a5e2efa6bf7df1a2932c2b148972839e173
font_02_sfnt_off0000882f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x882F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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