Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8edadcca351628…

MALICIOUS

PDF

40.8 KB Created: 2020-08-22 06:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b9c5dfa2d6c9440380a97c4f31a2499a SHA-1: d55bb0113dc39fbc23261ba8783f020697cd18c5 SHA-256: fd8edadcca3516288e80c248550f3be65b575f502d1bf6864c7ac2fae69acb20
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that leads to a link farm hosting numerous other PDFs. The document body, though heavily obfuscated, contains the target URL and keywords suggesting a lure for educational content. The ML classifier strongly indicates maliciousness, and the PDF-specific heuristics confirm the presence of malicious redirector and link farm behavior.

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=elementary+statistics+questions+and+answers+pdf In PDF document text
    • http://files.natureexperiencetours.com/uploads/1/3/1/4/131406736/kusuzinivimemapa.pdfIn PDF document text
    • http://files.thebowmanfund.org/uploads/1/3/1/4/131453919/gawin_gegun_lijaza.pdfIn PDF document text
    • http://files.oursavinggrace.co.uk/uploads/1/3/1/8/131856498/8cadd82d2a0a5.pdfIn PDF document text
    • http://files.davesartdimensions.com/uploads/1/3/1/6/131606348/vojetiborakupo.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/1/0433/9020/6115/files/54064582775.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7692/5078/files/20317001.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9712/0151/files/69067216627.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/9154/6532/files/pififaparavigofok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7602/5510/files/pobifofebutofa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8772/2648/files/54356119972.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/tutosajapavitos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/how_to_get_mending_enchantment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/budoribawamigosobadif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7329/6789/files/ccna_full_form_in_medical.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_off000060e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E4 5580 bytes
SHA-256: f3f12fdb58719c036ed90c2b8bdccd6bc3cd79669b8ea7d2af9279133ef2e5d3
font_01_sfnt_off000073d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73D7 10100 bytes
SHA-256: 09330c54b9e11ec9878cd319cf6a36a8f3eacf093be92038aa2b1038e2032f99

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