Malicious PDF — malware analysis report

Static analysis result for SHA-256 42815cbbffa860bf…

MALICIOUS

PDF

35.8 KB Created: 2020-08-15 21:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a9ef636a0c55add5523c057c434aecc3 SHA-1: abbf42de10ef6b0bb243c3af7fcd409d658e20fc SHA-256: 42815cbbffa860bf1dc4ef9e78568f35f0b4d1b0dbf15632c2534ae4ad28ccda
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggers the redirector, suggesting the primary purpose is to lure the user to a malicious site.

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/wb?keyword=knockin%20on%20heaven In PDF document text
    • http://regese.capristo-usa.net/uploads/1/3/1/3/131398091/jasorejuzibemig-vanefodej-xenuman.pdfIn PDF document text
    • http://files.canalvoyagewebradio.com/uploads/1/3/0/8/130814258/4e11bcae.pdfIn PDF document text
    • https://ttraff.ru/wb?keyword=knockin%20on%20heaven's%20door%20ukulele%20chords%20pdfIn 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/1/0429/5327/7596/files/14693983930.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3569/5016/files/biblio_scientifique.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2087/0044/files/exemple_d_avant_propos_d_un_rapport_de_stage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9703/0805/files/jubuzoki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5583/1445/files/44045472475.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3015/0309/files/gapewopemesan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6065/8330/files/2227479281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4319/1969/files/mutosafivibubuvetul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8649/5396/files/lifenigederuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6209/8085/files/79644169504.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0515/7269/files/89439311543.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_off00004dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DD5 5372 bytes
SHA-256: 419e7315def59e0d665c5dc064cce5653899a0cd0fee3557c02cd89606f4e0c6
font_01_sfnt_off00006013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6013 10104 bytes
SHA-256: 1e0aabf014b1cce746db511fc5a072828ca70f8cb32db04eb80603ccf94bb5bc

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