Malicious PDF — malware analysis report

Static analysis result for SHA-256 399a0410e87e1c34…

MALICIOUS

PDF

35.2 KB Created: 2020-08-11 21:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 33d96bae271d542fbd4d18eae2225182 SHA-1: 231add8f08c23d8eb1aea01ca09cb536235c59f9 SHA-256: 399a0410e87e1c344cd90ec1c8135d4815ec86b3a77399062cd374f89c63998f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service (ttraff.com) which is associated with malicious activity. The document body also contains the same redirector URL, suggesting an attempt to lure users to a malicious site under the guise of a book download. The ML classifier strongly supports the malicious verdict.

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=cookies%20week%20book%20pdf In PDF document text
    • http://files.thomascharlesbryda.com/uploads/1/3/0/9/130969855/mogogu.pdfIn PDF document text
    • http://files.usawesley.net/uploads/1/3/2/6/132695321/740eba6a29e.pdfIn PDF document text
    • http://bobivogu.afmsptsa.org/uploads/1/3/2/6/132682883/woravararip_vunaw_darajusagekelo.pdfIn PDF document text
    • http://files.lawofficesofmarkjcarrollpllc.com/uploads/1/3/2/6/132682048/5c87ebfd2d932.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/1/0427/7587/1654/files/88288616863.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3410/7286/files/24506514372.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/72724711611.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7217/3733/files/ejemplo_de_acta_constitutiva_de_una_sociedad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6545/9366/files/33837124503.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3986/4485/files/gerenorakolububed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/munulexalima.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6104/2591/files/energy_profile_diagram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/votejexiki.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 4

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_off00004d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D1D 4900 bytes
SHA-256: 460fa916ea9e2c1efabf9aaaa8524160b87982678df1b9199b27e5d49f140465
font_01_sfnt_off00005de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE9 10024 bytes
SHA-256: 93ec441298aa0b698c636c84df9262cc5d39a688910a33bc78a90126c3257853

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