Malicious PDF — malware analysis report

Static analysis result for SHA-256 991ff98d0d40669e…

MALICIOUS

PDF

39.4 KB Created: 2020-08-22 21:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: eec83b8584ef931e73c5397942a67da7 SHA-1: 99ab736c5383f7fa43e64a8c3ee993713bfd1e12 SHA-256: 991ff98d0d40669ed92f527fb154d82e40f1b8ab1cd0d8ddddb55defe85b9845
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text fragments related to lyrics and guides, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a malicious redirector indicates an attempt to lead the user to harmful content.

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=gangsta%2527+s+paradise+lyrics+pdf In PDF document text
    • http://files.mrscooksbayhighscienceclass.com/uploads/1/3/1/3/131384771/jejolibavosurejir.pdfIn PDF document text
    • http://files.psproofreading.com/uploads/1/3/2/7/132740637/vizopetegoru-balugaw-puxirawupe-dusizokuz.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/1/0440/3222/9541/files/76406944358.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5549/4806/files/zosigowalu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1963/1765/files/ginoporesuvegijamogatafa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8765/1235/files/80850331147.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7061/9801/files/dnd_5e_illusion_wizard_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9420/3815/files/bengali_album_song_video.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8534/0580/files/matisijezekuwefexut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/polonafebomi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/what_types_of_organisms_perform_chemosynthesis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/busigapofovufagexefawodu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9090/2166/files/spring_framework_reference_documentation_3._2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5287/4390/files/canticle_of_the_sun_haugen.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 4

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_off00005c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0A 5488 bytes
SHA-256: d47f01a2d625a675fbcada912f909dd0bca644674b60f8564a453dc2db204b00
font_01_sfnt_off00006edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDB 10028 bytes
SHA-256: f84bc7232b6ee3e80f1c0229640cbaad7826831cc6f1de00f96f21c9fed44e62

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