Malicious PDF — malware analysis report

Static analysis result for SHA-256 251a5e1bb6535a65…

MALICIOUS

PDF

45.2 KB Created: 2020-07-27 04:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2a9f2dd17828bc5edc05112f981a372d SHA-1: efb0d6d6f85e436386df96ee8f5dedebaf362003 SHA-256: 251a5e1bb6535a65dc1178ca82475c9bdbfb35e46550ac04fa7a7a35bf3e70a5
194 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Ui design templates psd free', suggesting a lure. The ML classifier also strongly flagged this PDF as malicious.

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=ui+design+templates+psd+free In PDF document text
    • http://files.lifeboxusa.org/uploads/1/3/1/3/131384468/zefutonusa.pdfIn PDF document text
    • http://files.drsphysioandwellness.com/uploads/1/3/0/7/130776204/6952e9d0f7bad.pdfIn PDF document text
    • http://files.lynneeast.com/uploads/1/3/0/9/130969746/6426614.pdfIn PDF document text
    • http://files.airlinesale.ca/uploads/1/3/0/8/130814611/ffab54.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/1/0437/0189/5322/files/diwifenori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5113/8715/files/15460268579.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/kebede.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1175/8491/files/pugowetubapemuretosepe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/jogojowesipunopeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5083/5878/files/92824834399.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5511/9512/files/kesodumosikukinesiwigex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1818/1016/files/79705908377.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5110/5947/files/kunulidafet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7922/7810/files/25518255638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/gilitafamijivawomurodar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/29135165737.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_off00006c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C98 5032 bytes
SHA-256: 5ac2cb3e4ecec63d0a8396aa85f81e908e719deb7703ef2bed95f72e7ef82dcc
font_01_sfnt_off00007d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8C 13424 bytes
SHA-256: 75af771ea3151fb1bf9efe3546c25ba1e71501ad94893a49afc09eda0ddfd0d4

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