Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c31cf2532998b09…

MALICIOUS

PDF

37.1 KB Created: 2020-08-13 03:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ee4f0da468921dc145b4c26e7877d22a SHA-1: d81ed1f4aa6a40dd511d73fc67146a5dd3e6df4f SHA-256: 1c31cf2532998b09d3a32bf42e4ca9d0278282089a50317a55a24c8bf942bb44
194 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate search results for educational materials. The primary link, https://ttraff.ru/pify?keyword=oxford+picture+dictionary+second+edition+workbook+pdf, redirects to malicious infrastructure, indicating a phishing or redirection attempt. The ML classifier strongly supports the malicious nature of this PDF.

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=oxford+picture+dictionary+second+edition+workbook+pdf In PDF document text
    • http://files.smithbrosplay.org/uploads/1/3/0/7/130739570/kujusuparejip-zovivumije.pdfIn PDF document text
    • http://files.healthstartfoundation.org/uploads/1/3/0/9/130969974/8039667.pdfIn PDF document text
    • http://files.attorneytallman.com/uploads/1/3/0/8/130813866/e070bbbfba.pdfIn PDF document text
    • http://zeteduvi.appleridgecooperativehomes.com/uploads/1/3/0/7/130776445/6985718.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/1/0437/6385/9610/files/16400198720.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8986/0510/files/stop_questionnaire_sleep_apnea.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/8137/2582/files/cooking_merit_badge_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/bisutar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5235/1144/files/11342468500.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/livro_de_administrao_financeira_e_oramentria_para_concursos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/fivifobavoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2493/0200/files/casadio_dieci_a2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7077/4679/files/30902157240.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 6

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_off00004f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F28 5612 bytes
SHA-256: 4a38ae0a8553f8f6456eff23a9acf1ca88ced52163ccf1808702a17ef73f7c51
font_01_sfnt_off0000626c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626C 11272 bytes
SHA-256: 614ef8539095c4498649aa62399c042e1ad849a0feb54f71ab22710af2ee24b5

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