Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51ef3bdb806d14e…

MALICIOUS

PDF

40.5 KB Created: 2020-08-13 18:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 424ec0d619bd301ff974679f4968a966 SHA-1: dcbfeec9781c2844a0c7cb3e8e3d8f0e0868774f SHA-256: b51ef3bdb806d14e72fbc8040a62c1e66280ee61d5d98ac70089c77ad5e12207
194 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to domains associated with link farms and redirectors, such as ttraff.com. The document body, though heavily obfuscated, contains references to 'Chicago manual of style reference' and includes the primary malicious URL. This suggests a phishing or malware delivery attempt disguised as a legitimate document.

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=chicago%20manual%20of%20style%20reference In PDF document text
    • http://files.stmarync.com/uploads/1/3/1/3/131381288/janifexi.pdfIn PDF document text
    • http://files.vanessa-culver.com/uploads/1/3/0/7/130775506/lekibimajobisun.pdfIn PDF document text
    • http://files.mercermovercompany.com/uploads/1/3/1/4/131437513/5865199.pdfIn PDF document text
    • http://jozelo.courtneytezeno.com/uploads/1/3/0/7/130776885/repef.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/1/0433/0805/6740/files/tupexilegor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5385/0528/files/segonalifi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9700/5981/files/xajubamulasajotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4190/5050/files/windows_7_iso_file_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9032/1313/files/98138114547.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2613/6731/files/12192893801.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4906/6397/files/bomamarilatakeli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5557/1353/files/zovemobegebimoxedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9775/8622/files/32652237043.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/nosivisorimuvinanatefaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7908/9824/files/bonilu.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 3

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_off00005f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3C 5300 bytes
SHA-256: 41847ae48d01adb088023cb052fea4e94c1e2e6908897cce9ee731f553168c55
font_01_sfnt_off00007127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7127 10060 bytes
SHA-256: a73b690e25d0da86a0109cc62175e3b1301dccf6554b0cb109c91d1e39db92e3

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