Malicious PDF — malware analysis report

Static analysis result for SHA-256 b413716905a5d6b5…

MALICIOUS

PDF

41.0 KB Created: 2020-08-09 06:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f8166608e7283646ea3ea4a8f3f83b1b SHA-1: c5bd26a0ab82df9da47dee7d0a15315230521a8d SHA-256: b413716905a5d6b5ca35149066cabf7c03c1711395b25bb4adcaedbc97e71e29
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, including a critical redirector link to 'https://ttraff.ru/pify?keyword=china+english+dictionary+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=china+english+dictionary+pdf In PDF document text
    • http://files.creativecounselingsrq.org/uploads/1/3/2/7/132710787/5366484.pdfIn PDF document text
    • http://files.strutboutiqueshop.com/uploads/1/3/0/7/130776204/1303263.pdfIn PDF document text
    • http://files.calvary-christianschool.com/uploads/1/3/1/4/131453401/4765253.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/1/0429/3640/2079/files/87977300064.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3070/7356/files/63939156204.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8856/6680/files/damudibujosemofu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/besarudobabiveturonefosuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1230/9670/files/sulimisafilale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0703/9895/files/top_free_books_download_sites.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5466/9729/files/71905525700.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5804/4826/files/35604199967.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8562/5499/files/the_caucasian_chalk_circle_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7680/5013/files/6728750471.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/off_road_trailer_plans.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1961/6935/files/olaudah_equiano_book.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_off000062a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A8 5424 bytes
SHA-256: 54b8224c2987541016d296fe66b884ecfe7b8b2ec440952c53a716e1ad807515
font_01_sfnt_off0000751c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x751C 9976 bytes
SHA-256: 6bf68245c3cf421e8a6442b4e419acd5ed2a230052c6a9748bd466c23f841181

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