Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec0640aeeb0b888…

MALICIOUS

PDF

45.8 KB Created: 2020-10-16 07:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: cfe373804361ba275210d358f76b5234 SHA-1: 7d45e7791ddd53646e7cd1a2e45d988ba176a270 SHA-256: 2ec0640aeeb0b8884e85e0b027597a8bae3f6a38aa24031fc301b0f719c7154f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass external link farm, with the primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to educational worksheets and includes the malicious URL, suggesting a lure for SEO poisoning or a similar traffic-driving scheme. No scripts were extracted, but the presence of the malicious redirector and the link farm strongly indicate a malicious intent to redirect users to harmful content.

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/pify?keyword=solving+quadratic+equations+worksheets+doc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5f87ea9bd78cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5f88c822b96bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f882c484fafc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f872dcebeaa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5f87ebfa43b7b.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/955d3b1d.pdfIn PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/zizurajet_fumizodiwo_gumoweveroz_fiken.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/3794757.pdfIn PDF document text
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/931685.pdfIn PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/piraboka-botazabubinug-zamawek-medowapapuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f8755ed6fb2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f8803ca9135b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f87200e98983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5f88d27a47125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f88fac1055c9.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/1/0431/3881/0023/files/19315176811.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2578/5255/files/67002304841.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/9993/6662/files/percentage_worksheets_6th_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2131/9323/files/23269959469.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1709/2769/files/usb_complete_the_developers_guide_fifth_edition_jan_axelson.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4944/9632/files/86351305625.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2558/8639/files/white_chicks_actors_brothers.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_off00007445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7445 5648 bytes
SHA-256: f6a3a8575feb839342f5734a978bb00c90ba0d400fedb683dcdfd82ef0ef5fbc
font_01_sfnt_off0000877a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x877A 9904 bytes
SHA-256: 72ca21b67770ebcdc7259c0037f8b7ec418283f2bd246cead70433be9c9e5aa0

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