Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b31ef16b0884816…

MALICIOUS

PDF

109.6 KB Created: 2020-08-05 05:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1c7edad10467a20743e946ce8e86c7f1 SHA-1: f9b031febf1e32faef4a5acd1a62554003c2e55a SHA-256: 7b31ef16b0884816eff86679ca58dfdfae660e1db2e79a0365d9464e7b8e36b0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a phishing or scam attempt. 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.com/wb?keyword=the%20613%20mitzvot%20pdf In PDF document text
    • http://files.martharinger.com/uploads/1/3/1/4/131438474/5918897.pdfIn PDF document text
    • http://files.jennifercarrpainting.com/uploads/1/3/1/3/131380005/nekulujasoseb_pogijisetapoj_givimudofil.pdfIn PDF document text
    • http://files.tara-sarahna.com/uploads/1/3/1/8/131857114/11bb05e81d.pdfIn PDF document text
    • http://files.gracecommunitycarshow.com/uploads/1/3/2/6/132681969/boditepazam-vedixanexe-kivaxot-niropu.pdfIn PDF document text
    • http://files.reyal.co.uk/uploads/1/3/1/6/131636954/4960771.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/1/0431/6564/7002/files/73936540189.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2037/6474/files/56376153673.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1907/4712/files/deliberate_risk_assessment_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0081/6028/files/realtek_network_drivers_windows_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5479/1832/files/histologia_del_pancreas_endocrino.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojedeteremedadedarovir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1130/9719/files/bidozazit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78394199391.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2137/6410/files/8028389218.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9590/8761/files/51691506143.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_off00016add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ADD 5196 bytes
SHA-256: b65add9a9d26c2cef659f05bfa4d342b69109bbadcbad41ce91cd1f96a787392
font_01_sfnt_off00017c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C84 13620 bytes
SHA-256: ef0dbaee89e71e02e69060c3e63bbec0eaf1049a842cd5234a53bb67dd88b951

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