Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b1101deebc920e…

MALICIOUS

PDF

44.5 KB Created: 2020-08-14 15:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0ac56e7a05ca627845a70a64ab08c796 SHA-1: fe038134aa8babbe60f3af0a4c933d07b9671929 SHA-256: 24b1101deebc920ea119ced40a9f9d1dae74393bc4166234a015450749199e9e
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a mass external PDF link farm, suggesting a SEO poisoning or link farm attack. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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/pify?keyword=curso+operador+de+calderas+industriales+pdf In PDF document text
    • http://files.authorshirts.com/uploads/1/3/1/3/131378852/gasumepotuju.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/1/0432/9734/1604/files/80792182985.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3020/6885/files/fozamagofakupaja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6099/2927/files/40488827588.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3504/0664/files/42084606245.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0349/3022/files/77910259220.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0778/6651/files/fikuxutamafof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0982/7231/files/9794443233.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9547/3822/files/bovelavi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5757/8137/files/49964418464.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
🗂 Part of campaign: authorshirts.com 3 samples

Related samples 2

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_off00005fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD0 5052 bytes
SHA-256: 49b87531b1970e49fb877f5ca06832ad42cc017287d4b2b82b6ff9f41eb0f14b
font_01_sfnt_off0000710e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x710E 11380 bytes
SHA-256: 6620aac9aeef64fb3f6803ca1a4f12dc4c090faaecf354177e8626e7b35e7e49
font_02_sfnt_off00009554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9554 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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