Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d56b4652342f51…

MALICIOUS

PDF

41.1 KB Created: 2020-08-12 20:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: db52d7b033ec1a1d359cf3f747acc8ae SHA-1: 12280810701fa1195dec914a9463fdc07781c1a7 SHA-256: 15d56b4652342f511f99b4d794d24cc22b9ce05dd9ef24c689bc8b90112064f0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service, disguised as free educational worksheets. The primary redirector URL is `https://ttraff.com/wb?keyword=free%20printable%20esl%20worksheets%20for%20preschool`, which is flagged as malicious. This suggests a phishing or SEO spam campaign aiming to drive traffic 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.com/wb?keyword=free%20printable%20esl%20worksheets%20for%20preschool In PDF document text
    • http://files.anjowholesale.com/uploads/1/3/1/1/131164398/vapeberom.pdfIn PDF document text
    • http://files.condoriskadvisors.com/uploads/1/3/1/0/131070351/4116339.pdfIn PDF document text
    • http://files.llgeans.com/uploads/1/3/0/7/130739463/wufizu.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/1/0440/7066/6392/files/wrightsville_beach_water_temp.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3376/3746/files/senisutizujugemitet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2278/5444/files/34555699851.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/dexewifaxasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8621/6344/files/56622582978.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/kesavazaxefiragewew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5391/6060/files/mowapamokonedogukazag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1456/9631/files/unholy_dk_pvp_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6631/8230/files/61866431352.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7368/3112/files/myocardial_infarction_ecg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6529/4491/files/19349979438.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_off0000625f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625F 5352 bytes
SHA-256: 9870cbeed8c7772532f4f5df4aceec06b45d421abe30cd45f5558e35d03ed151
font_01_sfnt_off0000749c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x749C 10308 bytes
SHA-256: 88ce6ee08fba037344dba3d1766deef4f717d53e6e8347d316cf70b9a0670cf5

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