Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b76bf726b3c99da…

MALICIOUS

PDF

38.6 KB Created: 2020-08-07 09:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4619c9ea6023f6a1a4167fbdc58ea929 SHA-1: 9d0bde191757ff15c1e6e12854b43c638abea6d7 SHA-256: 3b76bf726b3c99dabc35501d00461dd7482f94733509113a61bc15caa1617412
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to malicious infrastructure. The document body, though partially corrupted, contains text suggesting it's an exercise PDF, likely a lure. The primary malicious IOC is the redirector URL, which is used to funnel victims to 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=le+verbe+avoir+present+exercices+pdf In PDF document text
    • http://files.wvangler.com/uploads/1/3/2/6/132681586/fibudatib.pdfIn PDF document text
    • http://files.emmanuel-umc.org/uploads/1/3/2/7/132740338/wemuforot.pdfIn PDF document text
    • http://files.charmsandsparklebyria.com/uploads/1/3/0/8/130814855/vadoremuneminubis.pdfIn PDF document text
    • http://files.blacktriviabooks.com/uploads/1/3/2/6/132695194/9644589.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/1/0428/2508/9191/files/87680405830.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/delutuwovesumewaminaxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0453/2423/9003/files/article_critique_sample.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3393/4496/files/zojapalivozavibuvus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5749/4686/files/fe_civil_practice_problems.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zofes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/21712942053.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/suguru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4630/4933/files/1341312985.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/81086747925.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3225/4376/files/95999639572.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8386/6007/files/jajogulekujil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3177/3852/files/tojetixifalopafele.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7399/4905/files/xefitu.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 8

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_off00005389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5389 5328 bytes
SHA-256: 92008feec2c0f793646f6ef8662176ced6eef7bef3185f9d2f77e484abab21f7
font_01_sfnt_off000065be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BE 11840 bytes
SHA-256: 1b036746c19fa44c603e902a8ddba290d305479a6695a3d401ea0e94606ef0bc

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