Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1d21517839d52b…

MALICIOUS

PDF

47.6 KB Created: 2020-10-15 01:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 257fce0668a8e781d7f4f1665ac2e4cd SHA-1: 92cc38b6300168e6d62b09d0d5cd328745aad935 SHA-256: ec1d21517839d52b18006aad3a0c65b2076644f58f1d0f92a123ff5ba6e80d6d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings. This indicates a clear intent to direct users to potentially harmful external resources, likely for SEO poisoning or to serve further malicious 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/123?keyword=problemas+de+aplicacion+de+triangulos+rectangulos+pdf In PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/c25f730.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/pebegulawuveted.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/ruloxisok.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3355978.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/rorid_kuzijojawedemi_guvizeb_xajasip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f87395f5b445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f8768299145f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f8715dcd9c50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f8772435ecf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f875674673e0.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/1/0434/0993/2440/files/words_that_begin_with_quod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7290/3578/files/kuta_software_secant_angles_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7029/9038/files/tojigatelawozizoki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7759/1749/files/asus_p6x58d_premium_uefi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/krups_waffle_maker_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e25faab4-2649-420b-b4cf-108198470599/bedezuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d30d59b4-9290-4b66-9e33-079619f876af/jivawumidoxosazipoda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9068/3069/files/notokukoloforegetujukoliz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2578/3190/files/vinuwufoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0579/3688/files/7714611950.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_off000077f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77F2 5616 bytes
SHA-256: 17b061ca5f28d114cccdd4b05a6a5d6c16d34d9b1dfc9cc27d309351a0c0dd55
font_01_sfnt_off00008ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE6 11140 bytes
SHA-256: 9d0a45e13ff79def1d1473a26225f7d145eaa659b0b9af192cd8e18872855278

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