Malicious PDF — malware analysis report

Static analysis result for SHA-256 5518b5154242b0c0…

MALICIOUS

PDF

38.7 KB Created: 2020-08-15 18:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ea0e4797b4bf5feaf354bfbbb0946499 SHA-1: c0d93efc92f6e0eb7f3e86f337427674659b106a SHA-256: 5518b5154242b0c0f56afcf5e047b8e1c4df4ee51e7f35e037b45a3d0d2b268d
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a PDF link farm. One of these links, 'https://ttraff.com/wb?keyword=practical%20criticism%20notes%20pdf', points to known malicious redirector infrastructure. The document body is heavily obfuscated but contains similar URLs, suggesting a lure to external malicious content. No scripts were extracted, limiting the analysis of direct payload execution.

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=practical%20criticism%20notes%20pdf In PDF document text
    • http://files.denverleiday.org/uploads/1/3/2/6/132695701/limewaroki_sezotibesoduwe_sinugujejawizu_gazasoge.pdfIn PDF document text
    • http://bekowe.sweatlikeagirl.com/uploads/1/3/0/7/130739777/buboxibada.pdfIn PDF document text
    • http://files.silverrivercoaching.com/uploads/1/3/0/7/130740524/3993073.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/1/0433/4498/6262/files/11614134791.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/sexuality_in_african_culture.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8331/7926/files/sindrome_de_apnea_hipopnea_obstructiva_del_sueo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2136/8482/files/25096378415.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8451/2406/files/gunizelixig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2323/5232/files/59572219918.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9798/0056/files/runotarexowibosijixamik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/alice_in_wonderland_junior_script.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8136/6693/files/pifavipurezibu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1832/0034/files/dorejululazurabirigunipop.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_off00005a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A66 5300 bytes
SHA-256: 97e9e298184a4504aba054e9082a494f6979284b3739b52fd285574dacbe6e85
font_01_sfnt_off00006c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C45 9916 bytes
SHA-256: 03382575cc759363c93a0828a101199dba00843c1928dfc428f85fa37c7f983d

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