Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0e0cbde41b75b8…

MALICIOUS

PDF

40.4 KB Created: 2020-08-20 06:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4331b96f8aca6770c6cb0811e0cb21cd SHA-1: c1c6ba5df36e0b1f6dd13ddd01182c4d859ffe4b SHA-256: 4c0e0cbde41b75b8d7b1ce499a5e676d55bd3ee9faa80a57280574210a55c599
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'descriptive writing worksheet grade 5' and a URL that matches the malicious redirector. This suggests a social engineering lure to direct users to malicious infrastructure.

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=descriptive+writing+worksheet+grade+5 In PDF document text
    • http://files.justuschildrenbooks.com/uploads/1/3/1/1/131163859/2d758f0a1.pdfIn PDF document text
    • http://xosasud.loveofleos.com/uploads/1/3/0/7/130740080/68607602474e.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/1/0431/7482/2043/files/rozududojuxan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/0922/5382/files/bike_frame_design.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/24259347947.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2266/1278/files/oblivion_character_overhaul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6955/4329/files/dedapaxadujot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4921/3349/files/larag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8720/0418/files/64170448689.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1305/4359/files/jovised.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5883/9203/files/donakaduzedafe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/25978587190.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 3

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_off00005da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA6 5644 bytes
SHA-256: 19ead1ecb858964f0814be75ae09b9e2865cee0bbe96c29deb03e0e60c14a658
font_01_sfnt_off000070ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70EA 10540 bytes
SHA-256: 2f83a2cb30f1de4403d2928008b918eca0efe51e35dbbc9b012e612addf1aa8b

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