Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66ce48b0fbeac4f…

MALICIOUS

PDF

45.8 KB Created: 2020-08-06 11:39:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2368a647de76eaea707bb49a6650710a SHA-1: 720afa4556ce67a3cd95a5d208909af7e351320e SHA-256: b66ce48b0fbeac4f19885aad9a9dfa956b664ac1ca7c1429fb082b7eed8db79d
194 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The embedded document body contains a URL pointing to a redirector, which is also listed as a primary IOC. The ML classifier also strongly indicated maliciousness. The primary attack pattern is a lure to a malicious site, likely for SEO poisoning or phishing.

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=teoria+del+aprendizaje+social+y+desarrollo+de+la+personalidad+pdf In PDF document text
    • http://files.tapiaartstudio.com/uploads/1/3/1/4/131407315/limorogafilaboloz.pdfIn PDF document text
    • http://files.dogriverhorseclub.com/uploads/1/3/2/7/132740763/c909ad5398399.pdfIn PDF document text
    • http://files.thewineevent.org/uploads/1/3/0/8/130814208/3f89be7.pdfIn PDF document text
    • http://files.saverosselevator.com/uploads/1/3/0/8/130814636/dd695690.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/1/0435/2029/5064/files/vofiravusuwojekukiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/super_mario_bros_3_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7886/7358/files/cours_anglais_niveau_debutant.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0081/4998/files/taxukitimit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/59654297510.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5959/2859/files/ripemef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0205/1229/files/wubelogujururezojanes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4923/8179/files/fidusuvixo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3754/7929/files/26164254069.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9548/1750/files/43822760857.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3776/0408/files/naval_base_san_diego_zip_code.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 4

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_off00007217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7217 5324 bytes
SHA-256: 9dfa5565cc42387b84e6170cefdc2b653638f6c0bb972050e95fe81320597d47
font_01_sfnt_off00008459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8459 10776 bytes
SHA-256: a0ad39609149ac4805067a897d0282f5b8d4b1c32aa5f859e3b67bfa8b205aec

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