Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b7cc3bf41328ea…

MALICIOUS

PDF

56.5 KB Created: 2020-10-25 23:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 23542b309660137f077f109acce79c30 SHA-1: 30958410befb68301a261b7c1f15073c3e7a65a9 SHA-256: 91b7cc3bf41328ea5b928093f16de979c833d020d32899113245f21e53283b5a
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure, indicating a link farm designed for SEO manipulation or malicious redirection. The primary link identified, 'https://ttraff.me/123?keyword=robbins+patologia+pdf+capitulo+1', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to a medical textbook chapter.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.me/123?keyword=robbins+patologia+pdf+capitulo+1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f873db28e635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5f8b8c33ee556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383921/normal_5f952564e51ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383475/normal_5f936f590cd70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384036/normal_5f8e86b04b9ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f889d976b1fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5f8e6d3a6184b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5f8952d900bb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f8c8f014adf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5f9491d3953e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5f8e934777077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f874bbb3278e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5f89303e4b414.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/73aee795a001.pdfIn PDF document text
    • https://kudumegowejo.weebly.com/uploads/1/3/4/2/134266354/3f58744354.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/dumajapukixibi-kobifel-winimoletuso-radat.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/968470.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/4618049.pdfIn PDF document text
    • https://wemugevesusufe.weebly.com/uploads/1/3/4/4/134467109/zexiponusivoj_jaxitimore.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/10821a.pdfIn PDF document text
    • https://jugizefabugej.weebly.com/uploads/1/3/4/3/134377355/vigititaji.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/a32c07f1-0ec4-4aed-b68a-bafa8bdd6671/gifowusuxuzetitenataf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e111687-ce96-47bc-a59b-046525535765/imerys_santa_barbara_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bce571f-b272-4285-af9c-0ca2a760aa45/tisagegogavib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ae10a1-8e03-40c4-a627-5a0bafb9720e/35281815617.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000095a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95A3 1728 bytes
SHA-256: ac278a6a8c4b248b2079b91bf715912c835c20451f69126c05447c8a7667c2d7
font_01_sfnt_off00009e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E31 5428 bytes
SHA-256: ef99390749f4abf5fa62cac885a49dc0040a88797005d6918ec0eb50af133aa5
font_02_sfnt_off0000b0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B5 10520 bytes
SHA-256: ead19e3ef708735daf11993e62b6bfb97f7448b6ea1bbc6e6bf9c94593e5b4b6

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