Malicious PDF — malware analysis report

Static analysis result for SHA-256 849d4fe326e70644…

MALICIOUS

PDF

36.8 KB Created: 2020-08-21 06:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3b806ab1ccb0f74354faa4c4466a0758 SHA-1: 86767adff0738654f8f6aa7a33b894cb09db92ce SHA-256: 849d4fe326e70644f82f1395dccb65c9d03123e0d852350422747c8b82ad5bd5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary redirector URL is associated with known malicious activity and is used in an SEO link farm tactic to lure users with search terms like 'space galaxy animated wallpaper free'. The ML classifier strongly indicates maliciousness, supporting the conclusion that this is a phishing or redirection attempt.

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.ru/pify?keyword=space+galaxy+animated+wallpaper++free In PDF document text
    • http://files.chemungfire.com/uploads/1/3/1/4/131454523/0dff161.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/1/0438/8497/0152/files/30582708548.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4426/6399/files/dusijod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/komifudilogu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7744/9366/files/gelerevorurerof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/99242724750.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/counter_strike_1._6_original_game_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/6181/0076/files/bookkeeping_and_accounting_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7741/0724/files/64809682142.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0221/5069/files/wipazimoburer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6896/2469/files/wegurirakawokobajuwaw.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_off000050bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50BD 5664 bytes
SHA-256: 44ff1f39986d8e8f728e8d898c2ba92326e664f5c808d7a1dca7127f0b0f3835
font_01_sfnt_off000063f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F5 10120 bytes
SHA-256: afb658a8b9cba0399e7965a93e8481af93c7fd7db0052377221010a4d4487c27

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