Malicious PDF — malware analysis report

Static analysis result for SHA-256 817137b8c6b449b2…

MALICIOUS

PDF

45.9 KB Created: 2020-08-16 22:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a874aadd6e48946242b9251dcd96ab2b SHA-1: 01755c9aa4b7fcd8a0c9a5692ce180a2467b62d3 SHA-256: 817137b8c6b449b233311387b0e4961409a62d899fda265c6d1a8cb3f006b602
194 Risk Score

Malware Insights

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

This PDF document contains a link disguised as a definition, which redirects to a malicious URL. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results for phishing purposes. The document body itself is heavily obfuscated and contains numerous URLs, including the primary malicious redirector.

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/pify?keyword=sheet+silicate+structure+definition In PDF document text
    • http://files.denmarkffa.com/uploads/1/3/2/8/132814900/7893790.pdfIn PDF document text
    • http://files.thestudiosav.net/uploads/1/3/0/8/130814534/bufuse.pdfIn PDF document text
    • http://files.adamhitchcockdesign.com/uploads/1/3/1/3/131382032/vodeku-vegurivovoxe-tubisojuboweko.pdfIn PDF document text
    • http://geguwa.littlesilverems.com/uploads/1/3/0/7/130775455/fogipobo.pdfIn PDF document text
    • http://files.actionlearning.nl/uploads/1/3/2/8/132814073/6d35c049b8cb37.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/1/0431/6728/5410/files/42641334969.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/zadiradikudeliwafa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3621/1357/files/23703590620.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2565/2117/files/rifobijaxun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3853/0965/files/pradeep_biology_class_9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0364/0993/files/kinede.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0819/5751/files/advanced_language_practice_michael_vince_macmillan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/90509043041.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5671/7224/files/bunulerasabup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/naxepigetulorew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3725/3023/files/canon_mp160_ink.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6780/1749/files/xowimojasusoleferop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7458/3702/files/21683765303.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/4956354320.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_off00007495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7495 5212 bytes
SHA-256: af65f5c0ffe350aa5f5b797230b4e1996f7155e0bddb1cc2f04f3449760177b4
font_01_sfnt_off00008643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8643 11148 bytes
SHA-256: 61af1a0bfd4c06ad25063ce26bbd4608f889a2273bf73eeff6642e7d22487a2a