Malicious PDF — malware analysis report

Static analysis result for SHA-256 757d51c3ba97c537…

MALICIOUS

PDF

44.9 KB Created: 2020-08-18 16:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c9a09e75e1bd60e40a2ac5fb7a5804d6 SHA-1: fddef8d271c29ae586fd72c541f12344966f7c18 SHA-256: 757d51c3ba97c5375e38c08cc2992580b3f96ad7282faf244cfeb3eff8d6e505
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains multiple heuristics indicating malicious redirector links. The document body, though obfuscated, contains text related to 'Desmos introduction to geometry proofs answers' and a URL pointing to a redirector, suggesting a phishing or scam lure. The numerous embedded links, many pointing to benign Shopify URLs but others to unknown domains, are part of a link farm designed to obscure the malicious destination.

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.com/pify?keyword=desmos+introduction+to+geometry+proofs+answers In PDF document text
    • http://gubuzaza.engagechurchaurora.com/uploads/1/3/0/8/130874359/0c1e8588f34ad2.pdfIn PDF document text
    • http://sakojo.spanishduluth.com/uploads/1/3/1/4/131406086/8992109.pdfIn PDF document text
    • http://files.royalmarketingconcepts.com/uploads/1/3/1/3/131380741/997332.pdfIn PDF document text
    • http://files.chris-palmieri.com/uploads/1/3/0/8/130813582/pojafuseperojoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8747/0499/files/5176071901.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7142/9015/files/ceremonial_magic_israel_regardie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7950/6847/files/31640657590.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/marowuzumer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/zisunawafi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/65468572183.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6888/3097/files/ssc_stenographer_exam_paper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3413/2131/files/52979539796.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/1895/6448/files/atypical_facial_pain_adalah.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3893/1109/files/pojipele.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 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BA 5520 bytes
SHA-256: 84dfeb5166e2b1db1e1c4cac90be2ac194fa1715ff19ddf2be381a90ed4d12ed
font_01_sfnt_off00007581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7581 10236 bytes
SHA-256: 2805450c74ca35432c477b99be68cf145276f24a0b69dd1675cc831ab1d3bd03
font_02_sfnt_off00009860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9860 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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