Malicious PDF — malware analysis report

Static analysis result for SHA-256 736edb1eb81726e8…

MALICIOUS

PDF

44.1 KB Created: 2020-08-07 16:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d0dfd49e2e44271cbed7f97477603ed4 SHA-1: 89f3dba1ae19a4d325b59b50dbeaaeb27f3de88c SHA-256: 736edb1eb81726e89e49e2048ce85a32bca2971a8b9929b7297983d7fadd1595
194 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, disguised as a tool to reduce file size. The ML classifier strongly indicated maliciousness, and the presence of multiple external links suggests a link farm used for SEO poisoning to attract victims. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=reduce+pdf+file+size+macbook In PDF document text
    • http://files.adventuresav.com/uploads/1/3/1/8/131856409/6084706.pdfIn PDF document text
    • http://files.buy-ephedrine-uk.com/uploads/1/3/1/4/131438113/833393.pdfIn PDF document text
    • http://files.proseandcommas.org/uploads/1/3/1/0/131071082/6343639.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://cdn.shopify.com/s/files/1/0433/0687/7080/files/tuwupijisunuxavupo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1241/5907/files/zirelikigubulo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7228/2008/files/concept_of_marketing_information_system.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9580/9431/files/punemopegugisumeveve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/87369234032.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/begakosavawepogekazev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/xudesibomitokofo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7328/7830/files/58885079358.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/7802/9213/files/afr_2020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F65 5164 bytes
SHA-256: aaa60f7778d3046cb674e0488dcd196e309e3875acb787c1851816d7b2729b74
font_01_sfnt_off000070fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70FE 10784 bytes
SHA-256: 5cc0daee50dd3e13106979f8f899684bed3b6a6d162b38e52592d2563c78fe0d
font_02_sfnt_off0000959d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x959D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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