Malicious PDF — malware analysis report

Static analysis result for SHA-256 11981db9d5886540…

MALICIOUS

PDF

42.5 KB Created: 2020-08-15 14:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8f8fd121cf89b807192d0725005f449c SHA-1: da338dbc51f51c9eeddbfb349b56d106402f5455 SHA-256: 11981db9d5886540aaa3e9ac061a1e5470b689125eed7120c43282372c028518
194 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one prominently leading to a redirector disguised as a free software offer. The ML classifier and heuristics strongly indicate malicious intent, specifically a lure to download software. The primary IOC is the redirector URL, which likely leads to further malicious content.

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.cc/wb?keyword=nitro%20pdf%20full%20free In PDF document text
    • http://files.stmarymagdalenewpg.org/uploads/1/3/1/8/131856531/badifa.pdfIn PDF document text
    • http://files.teresacarosa.com/uploads/1/3/0/8/130814254/8407900.pdfIn PDF document text
    • http://files.canadianrivervalleyrevenge.com/uploads/1/3/0/7/130740443/5608059.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/1/0435/7337/9230/files/xekug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/7167656441.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9721/1551/files/hydraulic_bending_machine_project.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4424/1557/files/birthday_girl_murakami_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/47252016137.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5940/4197/files/kokuxosotabinuzuzibored.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9660/3814/files/losofuro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0067/6001/files/42679881428.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/26039261690.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5548/0981/files/bronchiolitis_guideline_ppt.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/4156/6370/files/asthma_action_plan_rch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4756/7010/files/qualitative_systematic_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/27305602884.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.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_off00006370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6370 4616 bytes
SHA-256: d73178cc1d68f2ebc59d4c65de2e2a2e37d934e9b201a2dfa7f21affd5cc1da2
font_01_sfnt_off00007333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7333 13092 bytes
SHA-256: 4e996fa48ac541ca90c613322432e88ac3d0650a90b12b52c50f5ab95b6b9e31

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