Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3ed8d058a12945…

MALICIOUS

PDF

38.2 KB Created: 2020-08-14 14:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 214fa70f12f57bf8a64720af182b7e65 SHA-1: 4bc9f6db3d5541fbcc60f4a1d909c5275169beea SHA-256: 7c3ed8d058a129457c5df1e840edf074d7f2e2e441683296a943160a91bb6921
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to appear as legitimate downloads but redirect to a malicious domain, identified as a redirector. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the use of a link farm and a malicious redirector. The embedded URLs are part of a SEO spam campaign to lure users to malicious 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/wb?keyword=oxford%20dictionary%20of%20biochemistry%20and%20molecular%20biology%20pdf In PDF document text
    • http://files.gcspatriots.org/uploads/1/3/0/7/130776099/e79ae.pdfIn PDF document text
    • http://files.radomirtodorov.com/uploads/1/3/1/0/131069961/xurefetala_ledemume.pdfIn PDF document text
    • http://files.artbylucymott.studio/uploads/1/3/0/8/130873872/ab769db3e.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/1/0432/4520/7714/files/21317675505.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7532/9436/files/vajefurofo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97046042130.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8563/4463/files/josarafopunuvedogijizur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5103/1464/files/49512363041.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3782/4926/files/risk_management_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/56527568352.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/77372511053.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3475/4728/files/natatojid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/9533161849.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_off00004fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FED 5908 bytes
SHA-256: 811d2868910c78f2901c1633a085185be54b8dd77b16e182bb28340ab7f7114e
font_01_sfnt_off000063e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E5 12476 bytes
SHA-256: f9bbae9e6dfbae59dca8efab78cdf9c64da32d95b9fb3bfd2a79bdd5f1437071

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