Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad5c9d81366bc4d…

MALICIOUS

PDF

41.0 KB Created: 2020-08-17 13:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3edc38ff79e52b9fb4f9e3d54f70ad12 SHA-1: e4f5ae016fde50f9f6e330353e106c698088e050 SHA-256: 8ad5c9d81366bc4d0eeaff702c4595a9f258713c5a024a395d36eb39bc750b1d
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text referencing an 'atomic structure worksheet 1 answers key' and includes the malicious URL. This suggests a social engineering lure to trick users into visiting the redirector, which likely leads to further malicious content.

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=atomic+structure+worksheet+1+answers+key In PDF document text
    • http://files.makatiprimeproperties.com/uploads/1/3/0/7/130775361/kufege.pdfIn PDF document text
    • http://dukadop.broken-kingdom.com/uploads/1/3/1/4/131407057/saret.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/1/0430/0010/3073/files/academic_drawing_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1167/0179/files/niguwabebezosazofeni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5916/7900/files/lupusirinuwajevik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4441/3341/files/analytical_essay_graphic_organizer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5918/2745/files/jilaganaxudusizavusewi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1465/2067/files/93144661338.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2619/4336/files/46349831159.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1209/4109/files/kudofetuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90296180399.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0177/4233/files/jexipita.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/rinunirajevuba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5274/4356/files/kaziwidaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9132/9173/files/mejemutererizazinemamoj.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 2

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_off0000617a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x617A 5308 bytes
SHA-256: 394ba8979c67a2550ea6ef406b71de00d1b0a0d56d266b603cd9b13962f35247
font_01_sfnt_off00007379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7379 9804 bytes
SHA-256: 13b4fa829dd8ca102b47a81a8942ebfc8d0752267fa2e85280dc4fdbb3ce00f4

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