Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf853d42504a47a…

MALICIOUS

PDF

43.3 KB Created: 2020-08-12 08:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4ecd7da16ae7e263a588c14ca261928c SHA-1: 35a94c86e73e2fd62cdf177d1d7555fda788feef SHA-256: dbf853d42504a47ae9e3d6269c172df109336d1f72e0c76b94de62cb68db18a8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, 'https://ttraff.cc/pify?keyword=bronchiolitis+journal+pdf', which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains references to 'Bronchiolitis journal pdf' and the authoring application 'wkhtmltopdf', indicating a lure to disguise malicious intent. No scripts were extracted from this sample.

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.cc/pify?keyword=bronchiolitis+journal+pdf In PDF document text
    • http://files.mayflowerimporters.com/uploads/1/3/1/4/131406605/gibepulidof.pdfIn PDF document text
    • http://files.shandryntrumble.com/uploads/1/3/1/4/131413362/xixegapejawepuro.pdfIn PDF document text
    • http://files.entomoanthro.org/uploads/1/3/2/6/132681201/261185.pdfIn PDF document text
    • http://ritepaz.4barmadillos.com/uploads/1/3/0/9/130968917/5373c0b0d8b9c.pdfIn PDF document text
    • http://files.villalta-artgallery.com/uploads/1/3/1/3/131380107/8031181.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/1/0432/8184/2341/files/doweramodo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5754/5365/files/brief_history_of_neoliberalism_david_harvey.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8008/9760/files/sabowikitanuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/0937/1286/files/vision_ias_budget_2020_20.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pajakeveposemilakojataza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/11757402537.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5320/1046/files/inter_national_khiladi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9134/6079/files/jorixilera.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/jesojadefokadokadolaleve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9499/0243/files/cambridge_english_test_b2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7149/4554/files/74827053738.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 8

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_off00006b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B43 5368 bytes
SHA-256: 71bfee2852cd6659a721dc26defbabe95b76369f5d66e42becad237a65ed220b
font_01_sfnt_off00007d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D79 10304 bytes
SHA-256: a1ad731777dd214e8a41c91deed4eafd2d0f193a5f40f490de1e5f9f9b144586

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