Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c4737942ebb0f5…

MALICIOUS

PDF

46.2 KB Created: 2020-08-15 12:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 33ac16bb3efbd75c4ce2485d492120fe SHA-1: 1e1d51cbdf9825440631348f1e79ac22e0ee0733 SHA-256: a8c4737942ebb0f5bbe34c04b8dd0f3531b20c5f8129b29df75bc259d98bd198
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious URL, disguised as a grammar test for IELTS. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of embedded links, many pointing to Shopify domains, suggesting a link farm for SEO manipulation or traffic redirection. No scripts were extracted, but the primary malicious action is the redirection to a harmful URL.

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.cc/wb?keyword=grammar%20test%20for%20ielts%20pdf In PDF document text
    • http://files.unalomesoapscandles.net/uploads/1/3/1/3/131380687/d41c6.pdfIn PDF document text
    • http://files.hijackingfieldtrips.com/uploads/1/3/2/7/132740564/gimobuf.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/1/0448/2298/6914/files/8014101717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6116/3670/files/great_man_theory_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5355/5624/files/gatuxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6481/8838/files/beware_the_dog_roald_dahl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/28896068472.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3672/8735/files/revelation_online_swordmage_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3410/7286/files/megorufoxewejujojotavaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lipowu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8962/5250/files/97539454434.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3998/8648/files/los_dioses_en_los_cdices_mexicanos_del_grupo_borgia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9827/4978/files/supply_chain_management_5th_edition_chopra.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/lolifuwojibanu.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_off0000777d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x777D 5220 bytes
SHA-256: 0bf5b4d51bb750c895d1ec85d274c1a8f6bbd12091d30c5d5515ce1efdd828e4
font_01_sfnt_off00008927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8927 10316 bytes
SHA-256: cde7ab270b89267a445297c3e5a185b397108c8baac187e4291c6b6f960a53f5

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