Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6960a8a614cfb61…

MALICIOUS

PDF

63.2 KB Created: 2020-10-15 23:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cf867c9209fd020dfb5c25c08b2364f5 SHA-1: 734dce103445c6d7a12f21cc01f39eb722a2d667 SHA-256: f6960a8a614cfb6111aed4201d47e48b52bc9045dce4ef852cb04259fada3b7f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The heuristic firings indicate a link farm and a malicious redirector, suggesting the primary purpose is to direct users to potentially harmful external websites. 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://gettraff.ru/123?keyword=necrosis+tubular+aguda+pediatria+pdf In PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/2065696.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/649272.pdfIn PDF document text
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/3381466.pdfIn PDF document text
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/1257824.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/2911433.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/0dccf6cc0ac261.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kekikefuwu.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/8d959c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367961/normal_5f87550a72c12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5f88794731456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f8885611853b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f86f88eccbbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/859480b5-6b5e-4c01-a62c-620f63f29ac3/29549830403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb1b6e66-b557-4497-b52f-c3d8003e90fb/puvapedowasixumadizolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b78ddc30-3415-4015-ac85-6bf80a8eb0ba/59381533201.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/0925/3791/files/81132805187.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8874/7937/files/mezabijewikuno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/14415408521.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3144/4128/files/infinite_jest_buy_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1079/9808/files/governing_the_ungovernable_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4230/7233/files/cusack_protocol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/4697/5905/files/17822274240.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8181/3154/files/wafanuwet.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_off0000af2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2C 5432 bytes
SHA-256: a33aae7f1635ad96ac13726792e4eb629c14adff3ed4d265edbac3833d131962
font_01_sfnt_off0000c1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AF 14720 bytes
SHA-256: 994ca66e6fd9bb209e517bdd7178437f30e6fe741b408472b2a36de5112864b7

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