Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e31b703e3c6b5dd…

MALICIOUS

PDF

55.6 KB Created: 2020-11-01 06:04:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5e6c5825524dcd47c97c3b881bb9a14c SHA-1: 1a24c3b5a10cefa5e37d92950430f46a338e3602 SHA-256: 3e31b703e3c6b5dd453c52ace8358ef293855ee58a5c0b03a546e2b07ddc9f30
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on redirector domains, indicating a link farm or phishing lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.me/123?keyword=historia+do+brasil+pdf as malicious. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary mechanism for directing users to potentially harmful content.

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.me/123?keyword=historia+do+brasil+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5f8a2bef30d43.pdfIn PDF document text
    • https://buxiniti.weebly.com/uploads/1/3/4/3/134309366/bavimifidene.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/038885c85ecf8f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5f91f9495e3ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388169/normal_5f95c716afafb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410986/normal_5f980dd77d5d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f91bdf867307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_5f8b685031c07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409811/normal_5f93dd5508938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_5f9a04b2c9289.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/1/0503/4865/4752/files/jevawetajeluvuwekawe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4564/2663/files/jiwevaxer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8292/2181/files/85530838179.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0408/3362/files/escuela_de_negocios_robert_kiyosaki_primera_edicion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6059/9202/files/marelli_motori_catalogue.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_off00009b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B2B 5136 bytes
SHA-256: 8a89e3ff71977ef5b700b51272537ea5ec1b0e9a284050f440a08c5da23975c3
font_01_sfnt_off0000aca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA5 11696 bytes
SHA-256: d5366dacffc5a97d77bbb07e0c338a6c6c1429a71ec352dc44bdec567bbb5a58

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