Malicious PDF — malware analysis report

Static analysis result for SHA-256 409a976b404abe48…

MALICIOUS

PDF

40.8 KB Created: 2020-07-28 04:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 852aceb8efa8d5108e7d2bc4c3e02064 SHA-1: 7dfee1f1f6ac4b96cf2fa02f4b08e0d273c0b4fe SHA-256: 409a976b404abe484b0636557c2fcd80b97b78b4e5b084acf1d0b95ed5c897cb
194 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a significant number of embedded links, a technique often used to lure users to malicious sites. One critical heuristic flagged a link to a known malicious redirector, and another identified a large PDF link farm. The document body contains metadata suggesting it was generated by wkhtmltopdf, but lacks clear user-facing text to indicate a specific lure.

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=pedir+in+preterite+form In PDF document text
    • http://files.misssantaclara.com/uploads/1/3/1/4/131437711/2819120.pdfIn PDF document text
    • http://files.dentalimagingconsultants.com/uploads/1/3/1/1/131164418/tawedakarorim_kadirax.pdfIn PDF document text
    • http://files.smokepitfairytales.com/uploads/1/3/1/4/131452815/losivinifi-dipukoxof.pdfIn PDF document text
    • http://files.catholicnewmancenterlssu.org/uploads/1/3/1/8/131856815/fetesi_defetinusome.pdfIn PDF document text
    • http://files.english.romekjanowskisvd.pl/uploads/1/3/0/7/130738614/5285495.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/1/0433/0687/7080/files/botudurodakokebavexosox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3291/0751/files/63096795336.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/18382678698.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5581/6608/files/ximuvoviz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9159/1321/files/65981702420.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/66716986855.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/62042090741.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/lixova.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6542/6598/files/xaroz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5371/7406/files/90528044639.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/pevaren.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 8

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_off0000647f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647F 4556 bytes
SHA-256: 86c261ee2c7b421959f14bd4f73254309f72775d725bbc2b1c3d950b33eae9c7
font_01_sfnt_off000073d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73D9 10296 bytes
SHA-256: 5cb090a094085ecdaf338d16d30dc1e8be974b46736d275bd6ec1d731d7ee784

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