Malicious PDF — malware analysis report

Static analysis result for SHA-256 c776a5df1889c49a…

MALICIOUS

PDF

41.5 KB Created: 2020-11-05 23:05:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f6e76e53aa9f3a605aa37db4a7fa86e8 SHA-1: e5db69f9a7a51cbd297310062d5cc35df264980e SHA-256: c776a5df1889c49aee1630edd996ca6703667805b21945dbd80ed81074a4afbf
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it links to known malicious redirector infrastructure, specifically a URL designed to lure users with a 'school calendar' keyword. The ML classifier also strongly flagged this PDF as malicious. The embedded URL is likely intended to redirect users to a phishing page or a download site for further malicious payloads.

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.
  • 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.
  • 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=federal+way+school+calendar+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5f9e1879bd8b5.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/wemogabufekatu-xarepevigilo-xinixixapasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5f930f07959b5.pdfIn PDF document text
    • https://mezuminekafowiw.weebly.com/uploads/1/3/4/3/134346911/030f01a06b379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f8f88986db78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_5fa079364d836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_5f959cb1266aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382789/normal_5f9358b344673.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f90ce126-6e96-4c11-87d1-a8c9b074eeb2/lomaxibemez.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/99565478786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bda7fa3-0057-4f93-ae43-1a533b97e8c1/vazevibisusuwuputisaj.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/zefifuzasukasama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749e7816-8a96-4796-b101-a13ccac18fbe/gedimoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9451ed4f-3d37-4b90-a6f3-c8a62d41f286/mikuni_vm22_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5874 5108 bytes
SHA-256: d08c54733fa7c9286517d804ec65c0a50c3152bf9f975e5ab0fbb72a273333e2
font_01_sfnt_off000069c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69C6 9780 bytes
SHA-256: 8920f2f651446a3409d43291a60ee9dffb8d7538fd37a2c214714a8da44aca0f
font_02_sfnt_off00008b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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