Malicious PDF — malware analysis report

Static analysis result for SHA-256 868b8ad6cc75453c…

MALICIOUS

PDF

42.8 KB Created: 2020-08-13 08:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a38bed705459c78bd22ffd674206985c SHA-1: 88a9d4415456b97d4667210b59dad9aff68f988b SHA-256: 868b8ad6cc75453cda684e6dc080e5ad11e1ffde85a57dd5f8fd913a3786a4ec
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a redirector service identified as malicious. The document body, though heavily obfuscated, contains the primary malicious URL and several benign-looking PDF links, suggesting a lure to download further content. The ML classifier strongly indicates maliciousness, and the presence of redirector links aligns with common phishing and scamming techniques.

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=science%20worksheets%20for%20grade%206 In PDF document text
    • http://files.rangerschoolofdance.com/uploads/1/3/1/3/131397973/supukilusitutu_lorexis_tozatevik.pdfIn PDF document text
    • http://kirok.emmaredmarchrose.com/uploads/1/3/1/1/131164250/fdffcdf714.pdfIn PDF document text
    • http://files.rowenglenkennels.com/uploads/1/3/0/7/130776131/144923.pdfIn PDF document text
    • http://jalun.sakbooks.com/uploads/1/3/2/7/132710507/waduzoj_jugojosas.pdfIn PDF document text
    • http://files.mountainhomeyogacenter.com/uploads/1/3/1/0/131071166/zaned-ramanuxater.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/1/0440/7335/3366/files/differences_between_american_and_british_english_grammar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3402/3848/files/mathematical_modelling_and_computer_simulation_of_activated_sludge_systems.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3234/6773/files/31871454370.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9900/4827/files/acer_aspire_one_756_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/92923209666.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5986/3961/files/tojefafinalegi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/88833640656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6153/3089/files/75515359999.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/68599023628.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2511/0952/files/ataxia_telangiectasia_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4842/6902/files/molewulenumabofuli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/zewoxevenejobikipu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/luwaduruxuzumakosewimev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4085/8527/files/7913553465.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D0 5664 bytes
SHA-256: 7a7420a1e66edf65f07b6df1a48ec4739c067d41c6119fb2f2bc0c0a92685c7c
font_01_sfnt_off00007b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B19 10180 bytes
SHA-256: 340f06d2d80224726c7531d2c63ba101a0fca7e30bc9e2977edc87947768d36c