Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c650e6d2b6a056…

MALICIOUS

PDF

42.3 KB Created: 2020-10-25 23:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c5c085eb38170dea62de9c48e9ae7f60 SHA-1: 91d75739aa889773b618e50b58ca0aea81c03146 SHA-256: 88c650e6d2b6a056200517c640b3c1a990b7a086e6a2d740e62112e1a69d10b1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains a large number of external links, many of which point to a redirector service. The primary link, 'https://ttraff.link/123?keyword=personality+theory+and+research+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting a link farm or phishing lure designed to redirect users to 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.link/123?keyword=personality+theory+and+research+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5f87129139fd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389804/normal_5f926d1f92e1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f8895ed88a4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f8b694b5f6b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5f8928e0ddefd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f875e85e3f00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_5f89fa4775e16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5f89e17c936a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5f93d5ba997f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f8b822cdca9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f95a08349633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_5f87e3c06617b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5f906614833f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5f8bfa04a4c4e.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/126930.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jasamejug-jenutuzudemeluf.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/5ce0bf53-809d-4c2e-bddf-1ff4dcb0d729/mutisube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9889306f-de00-40c4-97d1-523ad577ab13/wobogemujagoranewaruwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44680490-0042-49c3-8baf-afa3e2b733ef/12708091448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f10a05fa-f7b8-4dd5-8b7d-6a67bea7e320/25157905427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd8e4e1-d72e-4c70-9d7a-5411150e33d4/ib_chemistry_study_and_revision_guid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/959e9445-bcea-4c89-8b1e-1bb6ba39e35a/bixomibegovipiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28fe8a00-4714-423e-9495-123a4c7b461f/82586713403.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6846 5348 bytes
SHA-256: 8e5bf9db63b0849985b1fa7430a62dd338dbd8ed9bfc70df1ede559ece1e91ca
font_01_sfnt_off00007a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6E 9816 bytes
SHA-256: b7ee6fd06e0bfacb55fe7dd8ebc8a25c54869d2a3492a03d36291b44ec39aa78