Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb90802ecfd0844…

MALICIOUS

PDF

44.3 KB Created: 2020-10-09 10:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 41dc47d77610e6aee2805c023f8e2107 SHA-1: 287d566833b4868b931ca709b2115031ff65236a SHA-256: 5bb90802ecfd084468bb437a34486f2cf7ce53ef539606269640f9695894b2e0
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://gettraff.ru/strik?keyword=latent+heat+of+fusion+and+vaporization+worksheet In PDF document text
    • http://jereg.meghanharper.org/uploads/1/3/2/7/132740873/sujaxelujomavedekapa.pdfIn PDF document text
    • http://files.yoansewingstudio.com/uploads/1/3/1/4/131437350/af69a.pdfIn PDF document text
    • http://files.mattgriffinsartwork.com/uploads/1/3/2/6/132682404/1412960.pdfIn PDF document text
    • http://files.sunsethealthsafetyproducts.net/uploads/1/3/2/6/132681488/6838983.pdfIn PDF document text
    • http://melizib.fatherhoodcommunitysolutions.org/uploads/1/3/1/4/131454165/0dc3a616381c25.pdfIn PDF document text
    • http://files.stpeteskin.com/uploads/1/3/0/7/130775023/senekero.pdfIn PDF document text
    • http://files.chunkeymonkey40.com/uploads/1/3/1/6/131637814/591e233d.pdfIn PDF document text
    • http://files.avadhaniestate.net/uploads/1/3/1/8/131872178/waboxo.pdfIn PDF document text
    • http://dusepe.newportpaddleventnor.com/uploads/1/3/0/7/130739651/duxutagorawine.pdfIn PDF document text
    • http://tidifif.mingahouse.org/uploads/1/3/1/3/131383548/e52b8f04f41.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/1/0431/6073/1803/files/51227626238.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5791/3754/files/binowemebi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2430/4286/files/nothing_was_the_same_album_mp3_download_zip_facebook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1499/5099/files/kovokazawutaxago.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1548/7135/files/respironics_everflo_oxygen_concentrator_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d35250c8-f256-4330-a2a6-cd5ac5ff6d73/podatololuteno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b216d662-fa1c-4d8e-963c-f3d0f9befd02/muvibuzinefeziki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24734a02-ac30-4f1e-bc0d-87ea0314cc10/mugeperedevobufarakubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6edcf0bb-ec50-46d6-8087-f5b238399c56/49448243093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46994970-7a5c-423a-bbf9-cae2af4457c8/gatojosak.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5052 1964 bytes
SHA-256: 06d927bb2b6daf891478ab4cab90709232d593f7c9b2cc46f53d704c02e6609f
font_01_sfnt_off000059a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59A0 5304 bytes
SHA-256: ab22749c1184551015c1deed59ee20f3338c9c0f225d2508a6dd4ba4aae77802
font_02_sfnt_off00006bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCC 9892 bytes
SHA-256: 042f4dc6afd885b04c71ee2a87a2cc6e83a287f1c65325052232d46ef245353f
font_03_sfnt_off00008dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD3 16180 bytes
SHA-256: b7469274d85f8c96d7a4dd7adfc42f9344ec3148142af319488e40a1395911cd

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