Malicious PDF — malware analysis report

Static analysis result for SHA-256 639544e47547ffb5…

MALICIOUS

PDF

62.9 KB Created: 2020-08-15 13:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 25ac7faf5a871ac83b1df69066bc544c SHA-1: 66a58d07fed654214e6bcb9dad7ced1c509fc25d SHA-256: 639544e47547ffb53a3c80f08c293ad2319760c500404167e9bc14211add9b3f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF is designed as a lure to trick users into clicking a link, disguised as a free download for a technical handbook. The embedded link redirects to a known malicious infrastructure, indicating a phishing or malware distribution attempt. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=handbook%20of%20fingerprint%20recognition%20pdf%20free%20download In PDF document text
    • http://files.xileart.com/uploads/1/3/1/4/131453555/59fa485.pdfIn PDF document text
    • http://files.mainesten.org/uploads/1/3/1/4/131438245/limuwatematarid.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/1/0434/1796/0600/files/48223828076.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/negidabipes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/aconex_user_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3840/7832/files/52762235671.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0925/9158/files/lowes_mcalester_ok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6170/5888/files/agrochemicals_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/32047113054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5509/5712/files/fefowuxiwosapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/jefenizanujodiletifure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7430/3640/files/axiom_verge_cheats.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/auditoria_contable_ejemplo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9071/5548/files/1502978659.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 1

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_off0000b979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB979 5400 bytes
SHA-256: 46eb33e3e5cd6dcccd47929c0a17c09adbc6694192dbf605a795c25519c3ad76
font_01_sfnt_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 9972 bytes
SHA-256: 8ad7f728dc96f7c96d06c93641b24e9268a81779ae2cef1f575597ef45dd9af6

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