Malicious PDF — malware analysis report

Static analysis result for SHA-256 85da94dba44d4dbe…

MALICIOUS

PDF

46.5 KB Created: 2020-08-05 05:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 165d2ca3e6bc7c80ebe2d4dfbc6057b6 SHA-1: 7b0488f0b2bc572199e848e032cb841bfdf4402a SHA-256: 85da94dba44d4dbe5048d6d3daebf05cc1fd24ba8ee6b50f509d5dacd52ce673
194 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a "biology syllabus pdf download" lure, redirecting users to malicious infrastructure at ttraff.com. This is a common phishing tactic to trick users into downloading potentially harmful files. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to 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.com/pify?keyword=biology+syllabus+pdf+download In PDF document text
    • http://files.adamkaszycki.com/uploads/1/3/0/7/130776483/195181.pdfIn PDF document text
    • http://files.faithcheraw.org/uploads/1/3/1/4/131406649/6005751.pdfIn PDF document text
    • http://files.truenorthwelcomehome.com/uploads/1/3/1/3/131398323/jekolu_pijunaxak_xinebijarat.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/1/0430/0141/3785/files/lanozi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/89782479277.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7209/3336/files/gowajevikuvufiteberudu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/pugasu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3031/4133/files/2216934420.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2050/9596/files/7354442832.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/fojaniwix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9956/9832/files/75763017094.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/geforce_gtx_860m.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6961/1935/files/moxurajoboxek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5959/0806/files/gauhati_university_bsc_botany_syllabus.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 6

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_off00006e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5B 5496 bytes
SHA-256: fe0bc01254b6fcee28c83a356b3de5f93afa6145d5daa77c73dee34dd04ab8d7
font_01_sfnt_off0000813d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x813D 14124 bytes
SHA-256: c663455e5f6b997c3ebac36649e33877f5a27bd5e040669b57e2cbd863252cb6

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