Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99906b4084f2dc9…

MALICIOUS

PDF

42.4 KB Created: 2020-07-30 13:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3bfca98b6d46c764d7522d78188bb7c1 SHA-1: f3167daf43003ca088d3af29260b4339e4c6d4f0 SHA-256: d99906b4084f2dc94453f39c8a9b0f4380eb726d45e7eea50c78a11d474195a1
194 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. Additionally, PDF_SEO_LINK_FARM indicates a large number of external PDF links, likely for SEO manipulation or to host further malicious content. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a malicious site.

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=acceleration+practice+problems+pdf In PDF document text
    • http://files.charlenedixontaxservice.com/uploads/1/3/1/3/131380083/8491459.pdfIn PDF document text
    • http://files.hickmanhighschooltheatre.com/uploads/1/3/1/3/131379111/f61a0b993e1.pdfIn PDF document text
    • http://files.mendmyladder.com/uploads/1/3/0/7/130776536/ferawekakum.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/1/0433/0687/7080/files/78992801071.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9380/9557/files/mebuloborirotezadaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/vebixamu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/3734702753.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/jumodavuxisozivoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4327/4402/files/32699953627.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7600/9632/files/46560687951.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5589/6983/files/12039105090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3384/6183/files/90542793288.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9321/2827/files/71058158034.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_off0000699c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x699C 5220 bytes
SHA-256: 6ecf5beb7905c08361ff3c0defaedfe56cc51109aba49e44cc6c328eef4e11e1
font_01_sfnt_off00007b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B23 9760 bytes
SHA-256: 32610fbad8464c56ae13f84bb632348e2343787d93047da25c728c50fc8bb1d8

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