Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3864a2d5248ed4…

MALICIOUS

PDF

45.7 KB Created: 2020-08-05 05:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2e38da4dbb63c842a72fac6ae9d2b5f7 SHA-1: 7405208b8bd7bf2918292bfe0150e39957969cad SHA-256: ac3864a2d5248ed49d6c9a0de3065e1ccca69305735d8f754f4543009a59e86b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body text, though obfuscated, contains a URL that appears to be part of a link farm designed to lure users with seemingly legitimate document titles. 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/pify?keyword=an+introduction+to+applied+biogeography+pdf In PDF document text
    • http://files.mlintl.net/uploads/1/3/1/8/131856797/burejawedumalof.pdfIn PDF document text
    • http://files.easyaspitutoring.net/uploads/1/3/2/3/132302780/dibofozapov_vuxesosoxuvixe.pdfIn PDF document text
    • http://files.ftpc.org/uploads/1/3/0/7/130738779/5159646.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/1/0430/3519/7602/files/mejekatugosobuxaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/dujupabofegis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3009/2712/files/cisco_catalyst_3850_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42778697636.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/76066966766.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/96326003896.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/35090422285.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4253/6604/files/wadepi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5986/3961/files/mepevuwogadaxemizumun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/xevitobajaxugubowavam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9082/8700/files/8727901032.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5181/0969/files/38919608428.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1057/9865/files/dubulixoko.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_off0000750d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x750D 5468 bytes
SHA-256: 9b239df9ebbc580dbb740cd3b8432567d189f9a9f5a6aa31f522508fd5ef41e1
font_01_sfnt_off000087ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87AB 10364 bytes
SHA-256: b787e2049058bfe88fbe5a79ab6aa6b79fc352c41b1d5c1c46699e51a63ebd42

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