Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d526897bd92b343…

MALICIOUS

PDF

48.5 KB Created: 2020-11-06 00:48:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 20d1da77d1063ed30f18546d8c276b9c SHA-1: 9fafb65fcd6738857416fd56b851e9446409e8a3 SHA-256: 3d526897bd92b343cc0d36f97bc110091a4c6c4438b04f26f55c12b304a1c13c
136 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is part of an SEO link farm designed to redirect users. The primary malicious URL identified is 'https://traffnew.ru/strik?keyword=free+fnaf+games+download', which is presented as a lure for 'free fnaf games download'. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/strik?keyword=free+fnaf+games+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449004/normal_5f9fa03649bc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_5f8f7174cc56b.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/8574332.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/wutumozaj.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/1d760dd4-bc64-48f6-af3f-0406a64ff808/riverfest_2020_canton_ga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/529fa8a5-c1ab-441f-ab0f-264027cc8d12/kuxukemefe.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/navy_unit_reporting_for_fraternization.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/ccna_v6_final_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/64251472077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe30fe45-0582-43a8-9b71-17f699831332/mubaw.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/firewall_and_internet_security.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a5cf735-a9bb-4164-acbf-2c6aca6332d9/84433556537.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5287/3919/files/botuxakurabab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7757/3040/files/vefazidimizovaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84776caf-edab-42ce-8c21-589843eed5c3/tilikewo.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/mipuzemujejatokubup.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF0 5272 bytes
SHA-256: feafac63a68398ebb49ad2401a23d2fb48942b652aa88494d7a260d76224a9b4
font_01_sfnt_off000091e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91E0 10240 bytes
SHA-256: 7670e9aff38146b17ad581113647948f5c536b1d1c86c1178e285bc5c02b0d4d