Malicious PDF — malware analysis report

Static analysis result for SHA-256 a987d318599a374e…

MALICIOUS

PDF

43.6 KB Created: 2020-08-01 16:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5a9edba9a242fc7c50a834d7e130588f SHA-1: f1961bc2d4ed8b8ce57cd7fe2a9ef2327e2b0e36 SHA-256: a987d318599a374e732d3aec0b57cc0f9242a3584cbd8718fcf75cd408a0c8e7
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the same URL found in the heuristic firing, suggesting the intent is to lure the user to click the malicious link. The file is likely part of a link farm or SEO spam campaign designed to drive traffic to 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.cc/pify?keyword=introduction+to+heat+transfer+6th+edition+pdf In PDF document text
    • http://files.houghtonrangersjuniors.co.uk/uploads/1/3/0/8/130873758/mebipuzuwafadux.pdfIn PDF document text
    • http://files.shannonmariemakes.com/uploads/1/3/1/1/131163851/gobefavimuve-koxatimufir-zikenali.pdfIn PDF document text
    • http://files.advancedinsbrokersinc.com/uploads/1/3/2/7/132740778/1293826.pdfIn PDF document text
    • http://files.nextstepsdaycare.net/uploads/1/3/1/3/131384777/satam.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/1/0432/2358/0839/files/40509119338.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/mufelowenaliwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/rebigawamudod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2894/5815/files/palaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5593/8725/files/pojusetejiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3772/7637/files/gejigolowogegokurisibon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3658/0759/files/xoxofi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5850/2563/files/wopil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2825/6680/files/5780766314.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/1051/2280/files/fepijatafagax.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_off00006c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C33 5300 bytes
SHA-256: bf444518c27886bca0f222f3b8d3706bd4ebdf3f3336b21d0508f29296d54567
font_01_sfnt_off00007e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E32 10232 bytes
SHA-256: 66d6d4a21b7e590b8c9d69e83606dce1cc056b64a869a16ad8b88627e5c210bc

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