Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaacbcc1b5178d20…

MALICIOUS

PDF

36.2 KB Created: 2020-10-03 18:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 55425d7049d2831fd0cdfd2f96d36c12 SHA-1: 7fef7e64a99ea5cc9246b0cbaddd9f325120cd71 SHA-256: eaacbcc1b5178d2023c2727c1408567df7caec850c8f5f75a87ab7da67dbae73
192 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?keyword=dracula+oxford+bookworms+pdf+download In PDF document text
    • https://site-1039414.mozfiles.com/files/1039414/13829933662.pdfIn PDF document text
    • https://site-1036823.mozfiles.com/files/1036823/jimixijalebudifugasez.pdfIn PDF document text
    • https://site-1038700.mozfiles.com/files/1038700/pixubinoj.pdfIn PDF document text
    • http://midej.orock.co.nz/uploads/1/3/1/4/131409098/2138861.pdfIn PDF document text
    • http://files.troop965.org/uploads/1/3/1/3/131380397/1037236.pdfIn PDF document text
    • http://files.selfback.eu/uploads/1/3/1/3/131383826/1945275.pdfIn PDF document text
    • http://gapar.nutritionandhealthfiji.com/uploads/1/3/1/4/131483234/6924567.pdfIn PDF document text
    • https://site-1037115.mozfiles.com/files/1037115/27692432230.pdfIn PDF document text
    • https://site-1037906.mozfiles.com/files/1037906/49418138321.pdfIn PDF document text
    • https://site-1036826.mozfiles.com/files/1036826/42998552072.pdfIn PDF document text
    • https://site-1037164.mozfiles.com/files/1037164/28151759642.pdfIn PDF document text
    • https://site-1040442.mozfiles.com/files/1040442/89771839495.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/1/0434/3054/3512/files/robojumawufuwefuzonanaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4712/4135/files/uncharted_4_pc_steam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/52609048053.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3680/2214/files/simolarumadi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3853/8908/files/unix_systems_for_modern_architectures_download.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_off00004ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EC3 5664 bytes
SHA-256: 4bd03bbac4d08ad8ffe2f652bc693c202546bcbec6e822de24fa908a83594035
font_01_sfnt_off00006209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6209 9840 bytes
SHA-256: c63bd5e8c0d8ade9ba0dd6d622bbe9c3fbf322f314658deb0e1e162db581ae60

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