Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dee4a7e6bf3c1f…

MALICIOUS

PDF

42.2 KB Created: 2020-08-11 03:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 255f24fddbf469a26f96a65eaeaec2f8 SHA-1: e09bb417d77f3d77fc691d32b352ac4f1b61e2b8 SHA-256: 81dee4a7e6bf3c1fe8fa8f878cd6768c67c78dde5179d1adfe6f4798d00240b9
194 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector disguised as a 'thyroid diet chart pdf'. The embedded URLs and heuristic firings indicate a phishing attempt to redirect users to malicious infrastructure. No scripts were extracted, but the document body contains numerous URLs, suggesting a content-based lure.

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.
  • 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://ttraff.ru/pify?keyword=thyroid+diet+chart+pdf In PDF document text
    • http://files.norahoffmann.com/uploads/1/3/1/4/131437725/9097368.pdfIn PDF document text
    • http://kadesesog.jazikatxox.com/uploads/1/3/1/6/131606490/melodefito-vomuzu-ponowabidadega-luwerironon.pdfIn PDF document text
    • http://files.saltwaterschool.com/uploads/1/3/1/4/131438098/remunitimujutok.pdfIn PDF document text
    • http://files.suzannetank.net/uploads/1/3/0/7/130740191/dugifosam.pdfIn PDF document text
    • http://mijopi.petesfishtales.com/uploads/1/3/1/0/131070487/balewazijuzikud.pdfIn 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/1/0437/0432/0154/files/nikapebagefidakezotizuwuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8773/8533/files/how_to_paste_in_vim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9176/8984/files/libro_agilmente_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72707516801.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/chemistry_haloalkanes_and_haloarenes_ncert_solutions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30617095305.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9719/2603/files/business_source_documents.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2136/8472/files/author_s_point_of_view_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/2009_volkswagen_jetta_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2511/2994/files/mebujitosiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/veliwavuvanimufifubasimu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3475/4728/files/mudularazameraredetomusi.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6813 5084 bytes
SHA-256: b7c03a786b8194ffb07f40b6592b118cff8a197c333fa9d077196e14bb7cdf55
font_01_sfnt_off00007963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7963 10208 bytes
SHA-256: d8da48bbd77ae21981969c5195787f4f778d59d84e28ccfda2d707e8af4abc14

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