Malicious PDF — malware analysis report

Static analysis result for SHA-256 86dbd847c561388f…

MALICIOUS

PDF

42.0 KB Created: 2020-08-12 07:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7bd859cedc348be8910f033504515e68 SHA-1: c3404e4ca5328fb755d20bfd10aab7ca210ed1a1 SHA-256: 86dbd847c561388f4809696c655e480e6e4dc6bd9d4e69e139de86037f95f24e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a primary redirector pointing to a known malicious domain. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'free sample lease agreement'. The ML classifier strongly indicates maliciousness, and the presence of a redirector link suggests an attempt to lead the user to a malicious site for further exploitation.

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.com/wb?keyword=free%20sample%20lease%20agreement%20pdf In PDF document text
    • http://files.dermmedclinic.com/uploads/1/3/1/4/131437044/d092e6f31.pdfIn PDF document text
    • http://files.indianawatershedinitiative.com/uploads/1/3/0/7/130776611/5902327.pdfIn PDF document text
    • http://files.ocvbc.net/uploads/1/3/1/0/131069879/258d9.pdfIn PDF document text
    • http://nupapa.audiocognoscenti.com/uploads/1/3/0/8/130813612/saxuga_jewidolebifu_wefeweweji_rigibifizigen.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/1/0433/6533/5208/files/35728532236.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3141/3414/files/agriculture_in_africa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7028/3173/files/mastering_bitcoin_andreas_m._antonopoulos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4526/5318/files/jajajewe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6544/2455/files/31403164532.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4686/9911/files/29977329567.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wunize.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9082/8700/files/95683098424.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1310/4035/files/sunuxu.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 7

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_off00006661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6661 5316 bytes
SHA-256: 8c5f751d56687bbcfa839f78d5220dd9a24534223f6c263d60d44938f4f13681
font_01_sfnt_off00007863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7863 10344 bytes
SHA-256: 324cc774c73042b0293ba45a91405e517ca41c44377810185bec534425898578

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