Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61d3f7519f6f2b5…

MALICIOUS

PDF

39.8 KB Created: 2020-08-24 00:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fceb48f9a0ab2027612eaae5a1ea5e4c SHA-1: 8ee2b6aa5dace08079b2331a2a435733a7141741 SHA-256: d61d3f7519f6f2b504a6354558a3e24a1f39729646a0ec28f243927c774b9200
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic firing for a PDF link to known malicious redirector infrastructure. Another critical heuristic identified a PDF link farm, suggesting SEO manipulation or a distribution mechanism for malicious content. The ML classifier strongly indicated maliciousness. The document body itself appears to be malformed or contains obfuscated text, but the presence of the malicious redirector URL is a strong indicator of malicious intent.

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=identifying+types+of+pronouns+worksheet In PDF document text
    • http://files.peninsularoofing.com/uploads/1/3/1/4/131407691/7cbd29fa793.pdfIn PDF document text
    • http://files.platinumpoolsandpatios.com/uploads/1/3/1/6/131637014/purof_kanavenalojewew_wifudo.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/1/0430/8451/3444/files/united_artists_sunrise_mall_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0617/3081/files/terminal_commands_cheat_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/2434/5244/files/old_ayyappa_songs_malayalam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0319/7078/files/fakutosobezobilivutoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/35344614561.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1211/8952/files/15516825295.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2847/2220/files/kubakoma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/2630/4423/files/217203113.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5790/5818/files/81591764476.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6063/3504/files/biblioteca_cristianismo_primitivo.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 2

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_off00005e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E43 5256 bytes
SHA-256: a1d97a53e54ff80f3b50ffb647afdc40f285cbeed584a5e432f507efaca40746
font_01_sfnt_off0000703f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x703F 10204 bytes
SHA-256: f7058f5d033938ce93e487b67c4a4cafc5e980d1414ac4ae5d22bdb7c7b098c3

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