Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b722595a5ed7f2…

MALICIOUS

PDF

35.8 KB Created: 2020-09-17 06:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6549f110c8adc14e691e48a53579f09 SHA-1: ed2dc6595bc399e50ae564410f16989c4c85238d SHA-256: 80b722595a5ed7f224826de44aa85b4af766e5396ca516429c14ff71e98059a6
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or disposable hosting, indicating a link farm designed to drive traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious. The embedded links, such as 'https://ttraff.link/wix?keyword=calculating+density+worksheet+middle+school', are likely part of a phishing or scam campaign.

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.link/wix?keyword=calculating+density+worksheet+middle+school
    • http://files.truevibrancy.com/uploads/1/3/1/3/131383838/9fa8ea965e.pdf
    • http://giveda.strictlybraids.com/uploads/1/3/1/4/131437423/lojimareka.pdf
    • http://zuwuvak.lorigphotography.net/uploads/1/3/0/8/130874043/jojekadisuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1628/1512/files/good_night_images_hd_new_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9242/5384/files/webaxomutul.pdf
    • https://cdn.shopify.com/s/files/1/0437/5648/6807/files/corredores_biologicos_en_colombia.pdf
    • https://cdn.shopify.com/s/files/1/0439/8697/6926/files/sofazexosugilamawidumem.pdf
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/gakusaputedorapetupisez.pdf
    • https://58b6f329-104b-4634-9bf6-915941f06608.filesusr.com/ugd/e66789_55318ca308e24c7d9776c09059d47399.pdf?index=true
    • https://928643ce-2816-4109-9bad-254cad3f5f56.filesusr.com/ugd/43d598_bb3b44bc472d42b4b61076208d895ff7.pdf?index=true
    • https://810f30a2-1b6a-4e3e-89e2-bc8f0e0208f2.filesusr.com/ugd/99b222_898ccff8180243faae397e00d786ad74.pdf?index=true
    • https://95428146-d624-4a8d-8f32-21118efee38a.filesusr.com/ugd/717a42_50d9886c6bcf4368aabdaf67374700ff.pdf?index=true
    • https://b2913e38-8308-41bb-bd7c-d823c829d42f.filesusr.com/ugd/7a7fb1_b0b645b781ad4217a7f79e9e4e572870.pdf?index=true
    • https://2d136c6c-03d3-4d3b-9e4d-645749af39dc.filesusr.com/ugd/99965f_9f4d4c2c1792475da35d35fb9ce37e97.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ddf.bin
15884ebdd2fb53bea0579a485e56ac7c4bd3cf6acaf871fdc007edeed59a6726		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DDF 5516 bytes
font_01_sfnt_off00006083.bin
14df38b0bf53d91ce095976f95859bcd884133da5cc916252667576cd58ea14f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6083 9916 bytes

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