Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5d2b7d04aa9db5…

MALICIOUS

PDF

45.5 KB Created: 2020-11-05 08:14:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 446f89cb7c8c9fd5bea27a7d4de47135 SHA-1: b785c874741df0ef21e4af2d6e6412e4d4a7e88d SHA-256: cb5d2b7d04aa9db554986053aefce08e38c0abf69e903d656f8aeaf37bc8c949
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://ttraff.me/123?keyword=sons+of+norway+fargo+menu In PDF document text
    • https://pudijubo.weebly.com/uploads/1/3/4/3/134311311/wapesidenufisibabono.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/gunuraxed.pdfIn PDF document text
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/2327983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f8a945ead0e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420476/normal_5fa02ab6b6fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406473/normal_5f98e05df3d68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_5f8fdf4009870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_5f9bd30f60167.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/6497588.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/losif.pdfIn PDF document text
    • https://vokugekezigak.weebly.com/uploads/1/3/4/5/134592112/4826042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402718/normal_5f94308b3f2dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/soxukowotomaj/happy_wheels_unblocked_games_66_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/epidemic_vs_pandemic_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/imperial_cooking_guide.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_off00005d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D02 5352 bytes
SHA-256: f18ddbcef85713215a2c08180027dd92bb8fa1c008f338da2766fc74b40a59c7
font_01_sfnt_off00006f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F39 10868 bytes
SHA-256: f346b111d372e0fbc4760d2b311e21be1b954a23a326d88b53a6e23007751d9b
font_02_sfnt_off000093a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93A2 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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