Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9836ddd821f79a2…

MALICIOUS

PDF

42.3 KB Created: 2020-08-24 21:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4c0b83b9147827f0296031d145106e38 SHA-1: 29e83792f30b7f9cf38d9d9bc49eb626b96ccbdd SHA-256: d9836ddd821f79a2b4003e2cbe5fe3e11a039e7a3c4b189a24a9aee433fdb645
194 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to appear as a download source for Adobe Reader, but it redirects to a known malicious URL. The document body itself is heavily obfuscated but contains the malicious redirector URL and numerous other PDF links hosted on Shopify, likely to improve search engine ranking for malicious lures. The primary malicious IOC is the redirector URL.

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=adobe+reader+for+pc++free In PDF document text
    • http://files.mrbreen.org/uploads/1/3/2/8/132814476/67eb5ad106f80.pdfIn PDF document text
    • http://gikakop.mustardseeds.co/uploads/1/3/2/7/132740324/4205347.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/1/0448/1551/5805/files/9083430592.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/roxudoropere.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1968/1437/files/84680191256.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9617/8845/files/febevewurokudusanoxibu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6001/7814/files/99549145856.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8575/6568/files/agenda_2020_para_el_desarrollo_sostenible_mexico.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4636/2533/files/58759276387.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0221/5069/files/35396397850.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1723/8685/files/chava_kadambari_marathi_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6221/4304/files/migogajavuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2862/7107/files/bcd_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/popowodibenog.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 1

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_off00006726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6726 5068 bytes
SHA-256: c9fdc10ab16fca6680d11b552d1fdcc468cfc9f64205d54d0720ab2d0ab28a74
font_01_sfnt_off0000786c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x786C 10616 bytes
SHA-256: 6245d792414e7c429da8f451cec2387594dcc0982e542c87dc78cd89bccd7246

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