Malicious PDF — malware analysis report

Static analysis result for SHA-256 f866eb6512cf736f…

MALICIOUS

PDF

78.4 KB Created: 2020-11-09 03:47:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5fb412757f2ed8a1a72ac219e2ee85fc SHA-1: d822603536147c54b62fe42131c31e09d37b30b2 SHA-256: f866eb6512cf736f56ad528c33334809f07b55dba894726d6a78ed7dd7871f24
124 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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/123?keyword=p2p4u+firstrow+live+stream In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382186/normal_5f8dc1988b512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f91ef5c7eb14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5f91898724307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5f8c85454215d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3167c62-bf67-4d48-b8a4-ba15876fd787/fadajukoxujesero.pdfIn PDF document text
    • https://pilifajufid.files.wordpress.com/2020/11/gigoza.pdfIn PDF document text
    • https://semasixazogi.files.wordpress.com/2020/11/pataluwanezedipukekosup.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/katak.pdfIn PDF document text
    • https://rarokazuj.files.wordpress.com/2020/11/peruzer.pdfIn PDF document text
    • https://fizafadolozu.files.wordpress.com/2020/11/31713389540.pdfIn PDF document text
    • https://xujekotedi.files.wordpress.com/2020/11/xegipopimobokom.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD266 5420 bytes
SHA-256: 7fc4003de51d0af059f526ac97dd920d5e85a95dda7bbccf140af642307cc33b
font_01_sfnt_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 2376 bytes
SHA-256: 8418ed6a74d98adb4c4ff0e6f47b91c8f428b40fcc38909b574906cdee480371
font_02_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 12140 bytes
SHA-256: f910294cd754382ed4b99958d88219ed631fa082c2792caa4f939b78194d0014
font_03_sfnt_off000115df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DF 16460 bytes
SHA-256: c84721573ba97fa45a86c4a13bd5d0858067ad904f775fb43eb5cd0a5dc42987

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