Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a168baa403a7bf…

MALICIOUS

PDF

42.1 KB Created: 2020-08-22 02:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: facb2d31f25d900fbd782146b8e65b40 SHA-1: 3a6651be3a3bc1bd5b0123ddd1c25a7bd709a7a0 SHA-256: 51a168baa403a7bf30cd136980cfe5beff02ac17fae7a95ac5d185a9697f8f82
194 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a large number of embedded links, including one pointing to a known malicious redirector. The primary malicious link is https://ttraff.cc/pify?keyword=cutoff+wavelength+of+circular+waveguide, which likely serves as a gateway to further malicious content. The document body, though heavily obfuscated, also contains this URL and a list of other URLs hosted on Shopify, suggesting a link farm or redirection strategy.

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.cc/pify?keyword=cutoff+wavelength+of+circular+waveguide In PDF document text
    • http://files.omygoddess.com/uploads/1/3/2/6/132681443/7963587.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/1/0434/7019/2805/files/catecismo_de_la_iglesia_catolica_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9489/1943/files/48778983263.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/faleza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1776/2973/files/39692014801.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5680/8607/files/94303320102.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/veloti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/78826075920.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9517/8902/files/smithing_calc_osrs.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 2

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_off00005e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E21 5160 bytes
SHA-256: 432eb63cd92d9241afd41e84ab7b0cca3e9eb9c6e2afeb7f084986f0acf38b37
font_01_sfnt_off00006fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC6 13876 bytes
SHA-256: f6b910827cb7d812d5f9444629b48d32607a6beb0235969c4db05681e5651c86

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