Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8d3141a9a6a8b7…

MALICIOUS

PDF

44.7 KB Created: 2020-10-27 06:59:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2221f657717917d80dc21fe6cbf753ba SHA-1: 9b2a9f18580b722a1b22bc4245ed21c480f19c79 SHA-256: eb8d3141a9a6a8b702886957e613255acd82194eab334a2fd8586c4832bbc59f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure for free PDF downloads, which is consistent with the redirector URL's keyword. The presence of multiple links to S3 buckets and other cloud storage services suggests an attempt to host a large number of similar lures.

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://cctraff.ru/strik?keyword=the+science+of+cooking+pdf+free+download
    • https://vuxofuta.weebly.com/uploads/1/3/4/2/134235669/radawafa.pdf
    • https://cdn-cms.f-static.net/uploads/4390382/normal_5f9723c77d428.pdf
    • https://cdn-cms.f-static.net/uploads/4375518/normal_5f8a0c807f521.pdf
    • https://cdn-cms.f-static.net/uploads/4372707/normal_5f93b5eda825f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/forupokisip/50206747070.pdf
    • https://s3.amazonaws.com/banula/95935294183.pdf
    • https://s3.amazonaws.com/jamokaroxoj/bugepejatarerutipenavor.pdf
    • https://cdn.shopify.com/s/files/1/0440/1135/6318/files/fitness_trainer_and_trainee.pdf
    • https://cdn.shopify.com/s/files/1/0497/9225/4105/files/64792444373.pdf
    • https://cdn.shopify.com/s/files/1/0436/4946/6526/files/western_unimount_plow_parts.pdf
    • https://cdn.shopify.com/s/files/1/0432/1814/1341/files/tagaxipumefo.pdf
    • https://uploads.strikinglycdn.com/files/e03cb354-d78f-43f6-ac00-d02701ef6b74/13995631954.pdf
    • https://uploads.strikinglycdn.com/files/95f338ce-a785-4d69-b48d-c01735038ff0/vunutojixozadelimojimaz.pdf
    • https://uploads.strikinglycdn.com/files/7f17df4f-fe6b-459f-980e-10426d79ce83/2004_bmw_x5_3.0i_manual.pdf
    • https://uploads.strikinglycdn.com/files/2fdc60fe-b7ca-4f39-9b15-1e916743a934/98147361440.pdf
    • https://cdn.shopify.com/s/files/1/0501/6233/5919/files/zukufubuguzerapiwujowuka.pdf
    • https://cdn.shopify.com/s/files/1/0482/8921/8724/files/devoir_passe_compose_konjugieren.pdf
    • https://cdn.shopify.com/s/files/1/0435/5280/0929/files/71384292297.pdf
    • https://cdn.shopify.com/s/files/1/0463/8697/0779/files/rurejadajaz.pdf
    • https://cdn.shopify.com/s/files/1/0500/5505/3472/files/videos_de_amistad_para_una_amiga_especial.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d3c.bin
ec7d83de82dae0a3015378d68b40960f995e6a2ec38f7c007304879a263e084a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3C 5524 bytes
font_01_sfnt_off0000800a.bin
4e464cb64ffb551145adef45ee213a62ca3057e16d4e3cc0123936899eb4c514		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800A 11088 bytes

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