Malicious PDF — malware analysis report

Static analysis result for SHA-256 4451e334c7d77e65…

MALICIOUS

PDF

45.1 KB Created: 2020-11-08 15:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-12
MD5: 0d988de5a3ebe1346bf4efa5353efbea SHA-1: ebf177d9c0f28e7d1509ebfe926b74153972f2a7 SHA-256: 4451e334c7d77e65aa74c9ab2b00a6d3797b5b8911e1e6e6c357a2777c922541
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to a redirector URL (https://trafftec.ru/123?keyword=free+haisley+font) that appears to be part of an SEO link farm. This suggests an attempt to drive traffic to potentially malicious content under the guise of offering free fonts. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/123?keyword=free+haisley+font PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379241/normal_5fa661c84025a.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/dixubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_5f9ddb5831bda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f8766a1b88b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392873/normal_5f8ee353db4d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403683/normal_5fa14f851b867.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://s3.amazonaws.com/xuzed/slope_unblocked_unblocked_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc0a3a9f-713b-483c-8ff8-a7164ea03ee7/maroxabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f46c00-2902-482e-8e99-3292db84c06b/89220434211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deafba73-15f0-45b6-8ad9-dce2981f013b/nujatifetorabamawiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08fdc0e0-6fcd-4d14-8733-202d45fc6822/tivepomifadumo.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/le_gall_brownian_motion_martingales_and_stochastic_calculus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0688b554-771c-4b27-a4f7-77e9d1fdc586/rewivarivetaxoxesotinav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/018eaa5b-5fef-4ba4-b261-e606b1769e82/minecraft_pe_0.14_0_apk_indir.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_off00006390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6390 4700 bytes
SHA-256: 1a192368f952e1a48dcd7dc0aa2c7cc8cc68c96e8d9faababb3013d17af7490d
font_01_sfnt_off0000737a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x737A 11200 bytes
SHA-256: 6ef2b38a0502c153bf62a08f33b94279da220324d37f74117401ea8d834b81ef
font_02_sfnt_off000099ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99AD 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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