Malicious PDF — malware analysis report

Static analysis result for SHA-256 a563adc0d1eba169…

MALICIOUS

PDF

42.6 KB Created: 2020-10-15 13:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 35cb6c875091303793b5587954a72167 SHA-1: fc46ef10a3be8e0c6c1baa2d18accbe8e4f6add0 SHA-256: a563adc0d1eba1690d086bc198973988953c94b591dc24e9e19e9ba71ba1c054
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://cctraff.ru/strik?keyword=acta+de+nacimiento+chihuahua+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to 'acta de nacimiento chihuahua pdf'. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be directing users to a malicious URL.

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://cctraff.ru/strik?keyword=acta+de+nacimiento+chihuahua+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369633/normal_5f8812ee8ec4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_5f880b7641b6e.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/9031774.pdfIn PDF document text
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/fosutalefunuwi_levijawug_sesip.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/xelafale.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/7d26ac04-c0ef-4054-a961-a4bb8cc341da/bodubazizore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c01131-24cc-46dd-9f19-cc30ad0c43c1/laxaremexiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e9a204-9933-4722-aa5c-ee7febc639e7/65168949924.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0254/3778/files/setukonusajafaveraku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/38118246194.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1829/6216/files/99180069545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb3e07e0-cf0b-48f2-8a5a-61057d2dbeae/tepifujasogumazep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ddab015-6dd3-4009-98b6-03104f3b2c90/tisumip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9620108c-b766-48a4-804e-e503ad038344/48812574072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a7f3ce-a178-4b29-bf86-84dc3b1d2160/livijik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18fc4d5a-33fc-4b91-bab0-4f63c16c85b4/24627506026.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8094/4289/files/nsca_essentials_of_personal_training_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1713/2456/files/41054404264.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6703/8613/files/mixulipojopixi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8139/2827/files/highway_capacity_manual_2010_trb.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_off0000670a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x670A 5076 bytes
SHA-256: 869e85a1b959dd25db38d2ab7f32ca641af767ad0f0265144cefa7574f1afd09
font_01_sfnt_off00007827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7827 10892 bytes
SHA-256: 247eb3908ca00d3a6d1c465f7ea3150796909853304d630785b4a099c355112e

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