Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd670bb1fde00d76…

MALICIOUS

PDF

55.8 KB Created: 2020-08-01 10:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 41933db2d04de1eeb7e467d89a57fe15 SHA-1: f4883abd9e5571a490cadef5a0225d401aac8377 SHA-256: cd670bb1fde00d76e392315395b718dd594dba93af9abf6a6d36d4ddcdd023c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=cub+cadet+1641', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary function appears to be directing users to potentially harmful external 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://ttraff.ru/pify?keyword=cub+cadet+1641 In PDF document text
    • http://files.kmitchell.ca/uploads/1/3/1/3/131378975/lakudirosebanenusa.pdfIn PDF document text
    • http://files.natureandhealthyliving.com/uploads/1/3/0/9/130969372/megulanodiw.pdfIn PDF document text
    • http://files.jam247sound.com/uploads/1/3/0/9/130969543/3303745.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/1/0428/9835/8432/files/tokon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1342/2753/files/43245507070.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/finunaketavekatudibuka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8589/7627/files/25470153307.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8379/2548/files/dudovikurevixikefirovuzez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4365/8650/files/jawag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/moxav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7165/8392/files/82367003616.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7938/5756/files/php_size_of_array.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_off00009031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9031 4968 bytes
SHA-256: db5996997be5ccf24c7807e4142decf7d958cdc97c5ae6a538551b105d7992e6
font_01_sfnt_off0000a12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA12B 15864 bytes
SHA-256: 75bb9ca2a4e5a6fa5133780d47daed8da11051290f2f9f955a909754798f268a

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