Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b40011e9944a731…

MALICIOUS

PDF

56.3 KB Created: 2020-10-07 15:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0fcfddf48b758a50644913ea8489811b SHA-1: ccfd017265453cf397e892ba8e7c9ac40fc8e049 SHA-256: 4b40011e9944a731faf001b772ed7248c95843c6bb031cd737fe450ea8a69e06
184 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with one identified as a known malicious redirector. The majority of links point to PDF files hosted on numerous disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the structure points towards a malicious document designed to lure users to potentially harmful content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=%25D1%2584%25D1%2580%25D0%25B8%25D0%25BC%25D0%25B5%25D0%25B9%25D0%25BB+%25D0%25BC%25D0%25BE%25D1%258F+%25D0%25BF%25D0%25BE%25D1%2587%25D1%2582%25D0%25B0 In PDF document text
    • http://files.agathafashion.shop/uploads/1/3/0/9/130969375/9654079.pdfIn PDF document text
    • http://files.agentonthebeach.com/uploads/1/3/1/3/131397946/a425cef0.pdfIn PDF document text
    • http://files.msrammohan.com/uploads/1/3/0/9/130969887/b1ca54f.pdfIn PDF document text
    • http://wukevumo.theroadshetraveled.com/uploads/1/3/1/3/131398274/6791d4a1ef71253.pdfIn PDF document text
    • http://wudadidu.countryheartfarm.org/uploads/1/3/1/0/131069934/vufar_mejuves_kokugilex_toperixikumarir.pdfIn PDF document text
    • https://site-1037143.mozfiles.com/files/1037143/povatinuvavov.pdfIn PDF document text
    • https://site-1037859.mozfiles.com/files/1037859/nudisiwaxuzubuxar.pdfIn PDF document text
    • https://site-1036885.mozfiles.com/files/1036885/17269662577.pdfIn PDF document text
    • https://site-1043495.mozfiles.com/files/1043495/navozanokalimupiv.pdfIn PDF document text
    • https://site-1042604.mozfiles.com/files/1042604/mopafiwuvijapavujid.pdfIn PDF document text
    • https://site-1038358.mozfiles.com/files/1038358/35301083946.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0756/5209/files/9426611290.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4933/6483/files/16243388840.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9501/4042/files/55792239953.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80C4 4776 bytes
SHA-256: 22760b8f15db0c593176e3f1bdf4d0d7a3f25b7e2c60f73d69d11a20e05c48fe
font_01_sfnt_off00009111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9111 16376 bytes
SHA-256: ba535d7c7531ea0378d0d2ddf122969b1de6c36e052a5c7d01f1ae7bc81c0dc5
font_02_sfnt_off0000c434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC434 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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