Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bb83c400777f32…

MALICIOUS

PDF

38.0 KB Created: 2020-08-15 07:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9dd5189e9227b4d7721a446401c191c5 SHA-1: f1c6d6232bbac023aa57d5d57900c8acc74c0ae8 SHA-256: 77bb83c400777f32f034b340e14ba3e02f7f645435beb39673d1669d2d1a898d
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service that is known to host malicious content. The document body, though heavily obfuscated, contains text suggesting it is related to a "pdf difference checker online" and includes the malicious redirector URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests an attempt to create a link farm for SEO poisoning or to distribute malicious 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.cc/wb?keyword=pdf%20difference%20checker%20online In PDF document text
    • http://files.leithgordonltd.com/uploads/1/3/0/8/130813362/sefopemirugome_loxirexive.pdfIn PDF document text
    • http://files.pennstatecic.org/uploads/1/3/0/7/130775744/1740744.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/1/0429/5963/4591/files/78324502925.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2553/8973/files/18218624768.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2732/3301/files/69971989898.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/60228271571.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5431/6197/files/20332005409.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9734/8514/files/wowekanozis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6811/0488/files/suzonuranexotixukoko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3683/4981/files/85459952200.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 1

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_off00005a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A36 4784 bytes
SHA-256: 2667104a81d6b35e902aa2719b014445bce9858121bafaa2a882d864b372e4b2
font_01_sfnt_off00006a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6A 9804 bytes
SHA-256: e1b3dca86eeeb280bbaa9c7647879c3e2b739b52410797ceb848248369c10b87

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