Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b461dbfd5f91682…

MALICIOUS

PDF

41.2 KB Created: 2020-11-06 01:33:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8adf37f66da4331fcc717534f6e1efd8 SHA-1: b176735eb2bfb4a32a86aec0293cebad705927f6 SHA-256: 1b461dbfd5f916827b76553a37911f158d083324f549c0f333cc6989562b1752
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://traffset.ru/aws?keyword=bubble+letter+maker+online+free, is identified as an SEO redirector, likely used to funnel traffic to malicious sites or phishing pages. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/aws?keyword=bubble+letter+maker+online+free PDF link annotation
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/e75f81a5557ea0.pdfIn PDF document text
    • https://ziwavolenexajid.weebly.com/uploads/1/3/4/5/134503628/3884845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f8fbc2378f87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_5f98b156eaaf8.pdfIn PDF document text
    • https://liwobolavus.weebly.com/uploads/1/3/4/1/134131542/runisofaza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d312af3b-2d40-488b-9715-cbeb402ee765/kusopiburigumopizugiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee77b25f-79ca-49fb-ba58-1496db012afd/12167950617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe434f5d-2647-46b9-a736-cda161fcb6c1/zotawimuzawuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb3d157-3a3d-4bee-9540-ff9de08c9fe2/93583588778.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/mivivije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c5080b5-c8e1-4876-80cb-515424a3922a/20553722300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/885285cc-58a3-4bf9-8971-80a9c2f13074/83079198689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb2106e-a226-4e56-ba0e-9623bc7956a1/soxokupu.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 7

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_off0000625a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625A 4988 bytes
SHA-256: af0dd64a8160ac3fac28ceb0c61d9f27ca6b1fc55b15496b6411e22cd76df265
font_01_sfnt_off0000733e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x733E 10736 bytes
SHA-256: 1654438920e185d7f1b23bdb35b472036b2d73b0159198e0c04e63ef74f942ca

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