Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8610ede40275859…

MALICIOUS

PDF

39.0 KB Created: 2020-08-15 04:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 67f9db31617103a532a8ecbfbd89bac3 SHA-1: c3d163e8d2a51b6987999ec1e3a89363bce5f3b4 SHA-256: b8610ede40275859eff4645e6012f593f3e8965a693dbcb5fec850c69c98039f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The heuristic firings indicate this is a PDF link farm designed to host numerous external links. The primary malicious URL identified is https://ttraff.ru/wb?keyword=rhetorical%20question%20worksheet%20with%20answers, which likely serves as a gateway to further malicious content. No scripts were extracted from this sample.

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=rhetorical%20question%20worksheet%20with%20answers In PDF document text
    • http://files.slowfoodcaterers.com/uploads/1/3/1/4/131438013/1768033.pdfIn PDF document text
    • http://files.classwithchris.com/uploads/1/3/1/0/131069789/kejoleputunajated.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/1/0435/9897/1038/files/fidepopipadagibolefozipi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4460/9943/files/50335121089.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8839/6959/files/kiloniwurorisukefipulada.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8946/8328/files/44403335477.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7725/4814/files/jujozema.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1460/9305/files/runetowowafonev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/vazururadinarafakizeb.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 6

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_off00005a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A72 5176 bytes
SHA-256: b481e8535f52b61a152137dd481610702bd2f25adecd66056ffd63f1a83686bf
font_01_sfnt_off00006c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1F 10680 bytes
SHA-256: a23d894f867871ebc6d0232f44da5a6754628592d937f0da79e521108d455df7

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