Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40a839611b6ef23…

MALICIOUS

PDF

43.4 KB Created: 2020-08-23 14:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 53fb132ca45f88fa11f541e4a9553830 SHA-1: 4586816a432f4a697b4a9baed4996c777d76d92e SHA-256: c40a839611b6ef23303e0defb672fb3e114ef5058eaa8f1e76deb48036c8f3b5
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=kindergarten+number+worksheets+free, which is likely used to redirect users to further malicious content. The document body, though heavily obfuscated, contains references to this URL and other benign-looking Shopify links, suggesting a lure to disguise the malicious intent. No scripts were extracted from this sample.

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=kindergarten+number+worksheets+free In PDF document text
    • http://files.amyandrewsmusic.com/uploads/1/3/1/0/131070402/87588.pdfIn PDF document text
    • http://files.pumpkincurioushistory.com/uploads/1/3/2/6/132682826/1087e0b87d3111.pdfIn PDF document text
    • http://soxoki.bendbeeryoga.com/uploads/1/3/0/7/130739297/4982556.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/1/0430/5790/5818/files/wixalozed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/53067577947.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4146/3204/files/753629054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/4198/0317/files/android_accelerometer_speed_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7230/6846/files/1993379255.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2854/4668/files/features_of_neoclassical_poetry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5004/9446/files/laxod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4059/5355/files/84473501002.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/82781097410.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 4

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_off00006b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0B 5552 bytes
SHA-256: 88138a7a785bbd0a55b18b27479abb21eff70e31a9f59341581aa7895b45f52e
font_01_sfnt_off00007dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC6 10120 bytes
SHA-256: 5f59e21b984a68ba8786b04a8ca6bcd5278dff53770af8c278aca0f6bde46144

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