Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b1529e11d85328…

MALICIOUS

PDF

43.4 KB Created: 2020-08-04 15:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4e4f6c68e68b20ab523b7973acd45af2 SHA-1: ed70e4e83d5ac433a8e3839d4386305fa9d61fcf SHA-256: b8b1529e11d85328c7421c5df92566235907a30bea07f79ae73660f68a766f7c
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this is a link farm designed to distribute malicious content. The document body is heavily obfuscated and contains a URL that is likely part of the malicious infrastructure.

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/pify?keyword=the+weight+of+glory+pdf+cs+lewis In PDF document text
    • http://files.katascuba.com/uploads/1/3/1/4/131483253/5349126.pdfIn PDF document text
    • http://files.microlibrarybooks.com/uploads/1/3/0/7/130776073/9666360.pdfIn PDF document text
    • http://files.williamsportmdcommunityband.org/uploads/1/3/1/3/131383743/6261657.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/1/0428/9229/6359/files/dewotekusataf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3235/4711/files/86119007823.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/56399093460.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1424/8857/files/28629379745.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5813/3152/files/fuzedalurem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/livulotobalesuwevupuvem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57148414383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8933/7256/files/devenezovovivu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8489/7692/files/sovapeguva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4868/8033/files/symbiosis_lab_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1807/4786/files/26707163976.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 8

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_off00006b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B95 5348 bytes
SHA-256: c873a207957bb7efef38304233a53a3535496cc7e5a9d9784d1470ef52aadede
font_01_sfnt_off00007de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE8 10288 bytes
SHA-256: d219e6fbdfeedfbf4877e4170bebd130797a3f565b58cb49512b23b56eca0554

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