Malicious PDF — malware analysis report

Static analysis result for SHA-256 43db7886987e4eda…

MALICIOUS

PDF

45.3 KB Created: 2020-08-04 22:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c20e0fd2a9c3cb8de50534964a1bc6d1 SHA-1: 300c01d0c4774fa4279e732b30f3e100713bf149 SHA-256: 43db7886987e4edaf88d545d83e987218efa97a87d411bb0ab453230af6f72ab
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links to other PDF documents, a technique often used for SEO poisoning or to distribute malicious content. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=amendments+worksheet+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and what appears to be metadata from the wkhtmltopdf tool, suggesting it was programmatically generated to host these links.

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=amendments+worksheet+pdf In PDF document text
    • http://files.elementssalononline.com/uploads/1/3/1/6/131637316/50cb583733897b4.pdfIn PDF document text
    • http://kulomis.sarahpatzphd.com/uploads/1/3/1/3/131383791/nojigegel.pdfIn PDF document text
    • http://files.blend-boutique.com/uploads/1/3/1/0/131069863/verugirigupoz.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/1/0431/3179/7668/files/zotuvalilitefetesubefi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7548/5339/files/74042019641.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1490/6279/files/27755427728.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/38153880287.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/dodixokulowotogoli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/96517221659.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/36694220690.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/lofixe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3628/6877/files/75675572028.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3107/5743/files/88460383196.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6284/3797/files/apex_tv_manual.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_off000071b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B3 5184 bytes
SHA-256: 3f4aca99c54e65a943bbb67afb0232f79d92bf681309e5625f3072e67c997cd3
font_01_sfnt_off0000833f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x833F 11264 bytes
SHA-256: 2a9a997ee21fcef921338583a2865ed362abe03ea48cd84d83b6c6867e3f9fb0

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