Malicious PDF — malware analysis report

Static analysis result for SHA-256 857caaa952cf87f9…

MALICIOUS

PDF

96.7 KB Created: 2020-08-14 02:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ae846b06e2a348d0c68ea01557bc9146 SHA-1: 31d5f316dcb69d47914b3318bd6d59693b51616b SHA-256: 857caaa952cf87f93c3c8426ee8ebec4b9fb0095bd19904b2e280af65b3fe0fa
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external resources, masquerading as a tutorial to entice users. The primary link directs to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier strongly supports the malicious nature of this PDF, and the presence of embedded links suggests an attempt to lead the user to a malicious site.

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=tensorflow%202.0%20tutorial%20pdf In PDF document text
    • http://files.danahamilton.com/uploads/1/3/0/9/130969260/rovafavopaz_dugotupuxomef_zubosudus.pdfIn PDF document text
    • http://files.bampilates.com/uploads/1/3/1/4/131438741/1940dcd9a51.pdfIn PDF document text
    • http://kofabev.dailymewscharlotte.com/uploads/1/3/0/7/130740489/bojeroduvozi.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/1/0429/9443/4202/files/48840032952.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7097/9237/files/42608212879.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2668/5850/files/likuzififib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1216/1685/files/mick_jenkins_martyrs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/8310630395.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9648/8613/files/xowozinoxibiposu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/rozotagulupawadanofupibo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1987/8048/files/40498637270.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/2813216352.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/castellan_fisico_quimica_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2087/0044/files/regigumoxoxuzutiroro.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_off00012590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12590 5264 bytes
SHA-256: 1eddefdbc50962c6f118b58b459fd4708445c4c9680eed6840270f02d33483e1
font_01_sfnt_off00013794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13794 15652 bytes
SHA-256: 4d70befd8b1e3b5360d19da447fde66b969880aaec44abc0af96108ba1e224a2
font_02_sfnt_off00016816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16816 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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