Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff5773f1d4491b4…

MALICIOUS

PDF

34.7 KB Created: 2020-09-17 22:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8b4afff05a97d0a0e39f1bb1feb6467c SHA-1: 90c337f37d26e61922033d400a130f134d63d36d SHA-256: bff5773f1d4491b4cede7a163c05fcc8fd0a5aafa97b1165cc85e2b900052db1
194 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a free book download. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the 'PDF_SEO_LINK_FARM' heuristic indicates a large number of similar links, suggesting a spam or SEO poisoning campaign. The document body contains the same lure text and the malicious URL.

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.me/wix?keyword=the+green+witch+book+pdf+free+download In PDF document text
    • http://genonu.4littleoneshilo.net/uploads/1/3/1/3/131379103/xulukis-nisasisi.pdfIn PDF document text
    • http://files.queensofcountry.net/uploads/1/3/1/3/131398555/sudevokas-rurajowip-xevisefi.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/1/0440/6801/2182/files/15378827767.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/blank_budget_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0599/1322/files/campbell_biology_8th_edition_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/gogol_the_overcoat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0470/6818/4744/files/tipos_de_benzodiacepinas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2920/6939/files/vidmate_music_er_for_iphone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2838/8767/files/discord._js_cpu_usage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5249/1159/files/11651407531.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7451/9191/files/80467939877.pdfIn PDF document text
    • https://508baa65-62e3-46d8-a471-0e4db13b83e1.filesusr.com/ugd/5dc3ca_c891f59fd5494fe9b2635074ed2b1872.pdf?index=trueIn PDF document text
    • https://bb98d8c3-cb30-47ee-9a2d-7e4f1db016d6.filesusr.com/ugd/d55797_ebdaf52321b345cfbb03c933eeada205.pdf?index=trueIn 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_off000049ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49AE 5484 bytes
SHA-256: a106aec4a4dcd805a300706bd99e7b2e4b13616cc2ff38f1d83fe519033ffc04
font_01_sfnt_off00005c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C65 9900 bytes
SHA-256: 96ccfbf4199ade58c0f0e5400f09afeba3e012936f8f7d4a8eaa9f2461a534d6

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