Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd37b7b78c9b76c…

MALICIOUS

PDF

46.9 KB Created: 2020-08-08 15:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 586e3d009d78bc54c39861390bf9d9d5 SHA-1: c8d0ee04ee4c877bc77f6d73152706c2583e59f9 SHA-256: dcd37b7b78c9b76c183dd1d41ead98bf0fdab1c998b1692b3ded6959fc7f7290
194 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector, indicating an attempt to drive traffic to a malicious site. The embedded URL in the document body, 'https://ttraff.ru/pify?keyword=ielts+academic+writing+task+2+sample+answers+pdf', is a known malicious redirector. Additionally, the PDF links to numerous other PDFs hosted on cdn.shopify.com, suggesting a link farm used for SEO poisoning or traffic generation.

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=ielts+academic+writing+task+2+sample+answers+pdf In PDF document text
    • http://files.katascuba.com/uploads/1/3/1/4/131483253/5349126.pdfIn PDF document text
    • http://files.tribeplatypus.com/uploads/1/3/1/4/131437174/dcf7f.pdfIn PDF document text
    • http://files.kiefferphotography.com/uploads/1/3/2/7/132740378/fadet.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/1/0434/0721/2695/files/jazejewo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7009/5521/files/59942269680.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/19654538897.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vekedexixerokasadoboma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7328/9888/files/xogididotipisomawisovi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/89551127913.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5544/8213/files/goxagewesitavonub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0182/1859/files/wewivedapuronazixufopup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1582/2747/files/8970273366.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bewewolifokolugetu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/online_magazine_free_download.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_off000078e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78E9 5700 bytes
SHA-256: c74a4328a4e7fb6773976e8310d454ff09f6ba1f95eda6bb492463604e9c5efd
font_01_sfnt_off00008c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C59 9892 bytes
SHA-256: 10099ad9fce32a5b616b8e9e631076f1310d429a16077703c1438105dfbcc49c

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