Malicious PDF — malware analysis report

Static analysis result for SHA-256 64776ac4a1f0aee7…

MALICIOUS

PDF

51.4 KB Created: 2020-08-23 01:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d0133d7d79754177efbfbb04692ec13e SHA-1: d81eec0129f8183d6ab4e4cc32a69485695bcb2a SHA-256: 64776ac4a1f0aee73babc5cfb5e1a02f3875bd9aeae2cfbf7d4b832d48c85933
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the file is part of a phishing campaign designed to lead users to harmful sites.

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=chamfering+operation+on+lathe+machine+pdf In PDF document text
    • http://files.chopinsocietyofhouston.org/uploads/1/3/1/0/131070753/f8ace9cbdd.pdfIn PDF document text
    • http://fonep.thewatertank.co.uk/uploads/1/3/2/6/132681670/5faf0bf.pdfIn PDF document text
    • http://files.dianashepherd.co.uk/uploads/1/3/0/7/130739652/140a9dd8eb9ac.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/1/0456/8544/0671/files/8884652753.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3292/0732/files/kizodexakatad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1609/2828/files/mathematics_in_the_modern_world_textbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2063/1720/files/asamardhuni_jeeva_yatra_novel_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6244/3675/files/exercices_atomistiques.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7546/0517/files/autocad_commands_list_for_civil_engineering.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13534048661.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7144/6939/files/16509098552.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1167/8114/files/fodunujulomipiro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0918/5688/files/93156935836.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_off000088ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88CE 5296 bytes
SHA-256: 447cfe67eb167895ccb9bc86b970769b04b8887e9d09e5a1b7be404be2b0d9e4
font_01_sfnt_off00009aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AAC 11932 bytes
SHA-256: c03a361db2612cf39ade9312650b71382f8c073fdacc1a200da679097fe0c086

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