Malicious PDF — malware analysis report

Static analysis result for SHA-256 766e8d51a833fbb2…

MALICIOUS

PDF

57.9 KB Created: 2020-08-10 15:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 727e4a2c8339ba8be27744e32f452520 SHA-1: 85545a791e4a10a60240f4ad4fac99e3718e4682 SHA-256: 766e8d51a833fbb2f85af66f00a7f347c15f23d7686b6b9ee4813bd100622ef3
194 Risk Score

Malware Insights

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

The PDF contains numerous links to a redirector service (ttraff.ru) which is flagged as malicious. The document body, though heavily obfuscated, contains references to 'algebraic functions worksheet pdf' and the malicious URL, suggesting a lure for users seeking educational materials. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to a phishing site or download further 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.ru/pify?keyword=algebraic+functions+worksheet+pdf In PDF document text
    • http://files.spartanadvantage.com/uploads/1/3/1/4/131453221/xawigoloworaleno.pdfIn PDF document text
    • http://files.madebypaulineny.com/uploads/1/3/1/4/131455024/betefuso.pdfIn PDF document text
    • http://files.timothymax.org/uploads/1/3/1/3/131384127/fejip.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/1/0438/1219/2413/files/kefipidawemomafibatamib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/estados_financieros_ejemplos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/49248847593.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/amar_ujala_news_paper_file.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6971/0242/files/85813731562.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6487/6453/files/84605717586.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8528/2980/files/24081327505.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3136/2725/files/dazoda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/associative_memory_in_computer_architecture.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/vemulodusobifafuwuribaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1427/3693/files/myrkursablt_nightside_of_the_old_norse_mythology.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 7

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_off0000995d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x995D 5700 bytes
SHA-256: 6991b94727d1045e207000321725e6805f9de6930803d6f468f648965b3cd894
font_01_sfnt_off0000accf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACCF 14268 bytes
SHA-256: 6e57d13f436bfe5fd152c741d3afe6e99643b06c210757691c257203474ad588

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