Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3816f8b5bf6464…

MALICIOUS

PDF

34.6 KB Created: 2020-08-10 04:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 86b0bf76008e4c83e787cc0033c29bd8 SHA-1: 3985022460295cb7179d4b56792a825d59d2c151 SHA-256: 8d3816f8b5bf646481495deaef6a14279d56b9b8984d5bbede199d4c0c8a1edd
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to shopify.com, but one critical link directs to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains the string 'Interrai ltcf assessment form pdf' and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The presence of numerous PDF links indicates a link farm strategy, likely to improve search engine ranking for malicious content or to distribute malware.

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=interrai+ltcf+assessment+form+pdf In PDF document text
    • http://files.engineerabull.com/uploads/1/3/1/8/131856556/vejilupajukukiw-xijeke.pdfIn PDF document text
    • http://gulum.naildesignhouse.com/uploads/1/3/0/7/130775734/bazuvugijewikirix.pdfIn PDF document text
    • http://wipux.bonescanoeandcampground.com/uploads/1/3/0/8/130874276/zikobudejitidirojom.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/1/0432/7243/7910/files/74113696440.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2011/4327/files/62642475501.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/datapisinuwefatukokut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8324/2401/files/fabutimovetoporek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0970/3062/files/jutodek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4856/6938/files/10946390080.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5556/2398/files/adding_and_subtracting_radicals_quiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/fatazasemewikumexeliwede.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/mejagotapisibexoronatuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/jotonuzaxodew.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 5

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_off00004a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A18 5236 bytes
SHA-256: 6333eae01afcd94544e56147139689ac262013c4bdbce71fdd35c6b5b27d6ffb
font_01_sfnt_off00005bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD1 9940 bytes
SHA-256: 943cb72f1f8b9bfa0189d8a9857b3c61fdd99658a89ca945be2462a46ccdfbe1

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