Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d6a6aa10b23fd6…

MALICIOUS

PDF

61.9 KB Created: 2020-08-04 01:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b9f6d46ad706ae884b6313745eb3ac01 SHA-1: f80cc080c22ca986fd3550ec0ff0a23ff7dded84 SHA-256: f4d6a6aa10b23fd6303d8c745b0fc84d7e3641474ee1fd0639fff6cb122a0a21
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.cc/pify?keyword=mapa+renfe+cercanias+madrid+pdf In PDF document text
    • http://files.imperialsolutionsllc.com/uploads/1/3/0/7/130739463/bonob.pdfIn PDF document text
    • http://files.covenantwilkesarp.org/uploads/1/3/0/7/130776601/vedifotugusawo.pdfIn PDF document text
    • http://files.hellovetmed.com/uploads/1/3/1/0/131069766/8f90fa1.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/1/0433/4023/4902/files/97693375005.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9064/1045/files/limavofo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9879/1322/files/85454292515.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4603/4853/files/9715866678.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/potali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6960/4001/files/gatilekatosedu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6499/9590/files/bibasav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6343/5679/files/fejumezufijo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5661/8917/files/85347239849.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3402/4855/files/name_of_the_wind_movie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4620/7650/files/duxalota.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0727/8247/files/gejafif.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB2 5276 bytes
SHA-256: f69b9b47bad2571205c58f1668a73442edafb594b2bc745e9673107517c66b4b
font_01_sfnt_off0000a198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA198 16232 bytes
SHA-256: 5bc71b86b40e0f9d811df4cb65b9407e316fdb398549a3c7d70a14412535eddd
font_02_sfnt_off0000d427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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