Malicious PDF — malware analysis report

Static analysis result for SHA-256 d840af095c72f3f6…

MALICIOUS

PDF

50.6 KB Created: 2020-11-05 02:42:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 38374866e1fd79edff86ae21cef34888 SHA-1: 924fa314d5d82bb8ad2b2a727951fe5d7d6062f1 SHA-256: d840af095c72f3f61fbe5337ac9ebd0407774f4f0a18661f433be629f565f0d1
154 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 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://ggtraff.ru/strik?keyword=numbers+1+to+1000+in+spanish+quiz In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375351/normal_5f8a16cca16c1.pdfIn PDF document text
    • https://rulakufip.weebly.com/uploads/1/3/4/4/134489053/9843607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_5f97faf1b43d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5f930a4aef989.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/e0293d00-7ade-4713-af10-aa6d275ea3bc/wafezazipujokikabowoki.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/probabilidad_a_priori_y_a_posteriori.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/boost_c_application_development_cookbook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36159978-da2c-4aef-a9af-3c549e190080/pharmacology_for_nursing_care_8th_edition_table_of_contents.pdfIn PDF document text
    • https://s3.amazonaws.com/kepevipawit/padmavati_full_movie_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c08d1f-251b-4782-a9be-8d283de24bdb/61919772028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6ead3bb-758b-4bf4-8d53-5ae08fd49eb2/40964203384.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/the_trumpet_of_the_swan.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/capacity_requirement_planning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eaf2ae5-d7fd-4f2e-84eb-5761cc8a7997/67954635771.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_off000063cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63CD 5504 bytes
SHA-256: 4ad214b1dae6d561617eff60b5a4c1116f6decc31941d57f992d46d198fc6343
font_01_sfnt_off00007662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7662 2524 bytes
SHA-256: ddc465a240ad4abc26b34f48bb0d21bbcb643b6dd857ff79b662a9a481d52df9
font_02_sfnt_off0000810b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x810B 11336 bytes
SHA-256: 57c70cabc5b51dc7212dee18842afb0f5d6dfc60b28af3c1165fdf89e1c8e8d4
font_03_sfnt_off0000a7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7D3 16096 bytes
SHA-256: 2dff1fc3e5bf1049a512ca2ab3d4448021a5e4676c0c9a63fbc3d390c83797d9

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