Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ed8785f4004dec…

MALICIOUS

PDF

40.4 KB Created: 2020-08-24 11:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8719759ec71bfd669a8dd4bfcc610826 SHA-1: 621ca89a3e8038b6c368e257e41f502f49d8522c SHA-256: 83ed8785f4004dec20894102441e061aa9a66f67130a7af02ec6d31d283b8b1a
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 infrastructure associated with malicious activity. The document body, though heavily obfuscated, contains text related to 'Ncaa clearinghouse information sheet' and a URL that is also flagged as a malicious redirector. This suggests a phishing or malware distribution attempt, likely using the NCAA clearinghouse as a lure to encourage clicks on the malicious links.

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=ncaa+clearinghouse+information+sheet In PDF document text
    • http://vizokekud.smalleyestate.myhackney.org/uploads/1/3/0/7/130775643/6d8c29fb860c.pdfIn PDF document text
    • http://lerovuw.stevedurow.com/uploads/1/3/2/7/132712109/lakugejuwere_xataponud.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/1/0440/7836/6872/files/buzulolixop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8812/5857/files/rixisezawaverapajuwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/79348642796.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9087/8372/files/dudujorokunako.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6895/6573/files/sojabajes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1269/1880/files/aycliffe_drive_primary_school_uniform.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5639/0559/files/dijutudasitewozefeda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1943/6185/files/32433913300.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/62268613144.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2865/8848/files/15261851011.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0713/0270/files/query_remove_duplicates_google_sheets.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 2

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_off00005f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3D 5264 bytes
SHA-256: c40a8311f894335e230d13c76c9917ad62d5c78b2527917648e098241b197e4d
font_01_sfnt_off000070f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70F6 10476 bytes
SHA-256: 439630ff7a3be9ab3191c5c1ba56b4b1f474665deee2e253bed2d9bd2aa5ef09

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