Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c88c396b1a79ca…

MALICIOUS

PDF

33.2 KB Created: 2020-08-16 01:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4f3f648afbdcad247ab316803fb73f5d SHA-1: 1222b7b289ed5e340f4c54723b1b1c05ac8be47c SHA-256: d1c88c396b1a79caf1518722878630a4fb6694adb8e3b8b0220962ec09c91ed8
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically flagging it as a PDF SEO link farm. The primary malicious URL, 'https://ttraff.com/wb?keyword=cursive%20worksheet%20maker', is identified as a redirector. The document's purpose appears to be SEO manipulation or user redirection rather than direct exploitation, as no scripts were extracted.

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=cursive%20worksheet%20maker In PDF document text
    • http://files.christinareid.org/uploads/1/3/0/8/130874111/vojekide-vojegalewozujo-komabizesi-bofawofoma.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/1/0430/4325/8519/files/19190758730.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/6740496176.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/paxefolukujigebepikitakut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/81798179097.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6877/4807/files/dowam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/26901542555.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0936/7461/files/69204832328.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0692/4712/files/mumililaniw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0876/8675/files/dodulorokoveniritirel.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 1

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_off00004464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4464 5012 bytes
SHA-256: 974dfb9e7cc8b06b3e7ed5d03b62639a3995744b064ecaecdd6014d8385a9991
font_01_sfnt_off0000555a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x555A 10296 bytes
SHA-256: ed3e830b277204243d113b7fa1dd6e2d761e649f74a0be306843ef2cd03d9ade

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