Malicious PDF — malware analysis report

Static analysis result for SHA-256 5755506d83f1a040…

MALICIOUS

PDF

43.2 KB Created: 2020-10-30 03:27:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d863d5675d63290620308a73bf84e83e SHA-1: 1f2a3c00ecd1dcef913480bb76e1e8b460944320 SHA-256: 5755506d83f1a04067aba4e5fa524bd990705baf3bac864ed4adcfd40a8ddbae
184 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm or SEO manipulation tactic. One URL, 'https://ttraff.me/123?keyword=line+plots+5th+grade+lesson', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body contains garbled text and a few recognizable strings, including the malicious redirector URL and a list of Weebly-hosted PDF links.

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=line+plots+5th+grade+lesson In PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/nufupu-waler.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/toxapa-vitiwi.pdfIn PDF document text
    • https://zabugusu.weebly.com/uploads/1/3/4/3/134311035/fakejukeninipi_sepuxigosi_vidikupiderumib_fejadukuxobip.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/dagilug-gukakiwe-gevowadagego.pdfIn PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/rawaniluvezeza.pdfIn PDF document text
    • https://zamizugupaf.weebly.com/uploads/1/3/3/9/133999186/524150593.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/genodabaxolel-fawamezutitagos-tamarovasar-foxajutokisuz.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/tugunari_fogeze_nezejavoz.pdfIn PDF document text
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/e68949abad.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/6574471.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/1/0502/6005/0092/files/23929435456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096e0ae2-8541-477c-9f4e-ed84f95da0dd/79413778010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b4d1bd-5b91-4a4c-81d6-b9548de2bce3/45346065080.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_off00005cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB9 5072 bytes
SHA-256: f5e454a47a006f709bc8a73e18fb6628862a45865303f2d2d59b1408d445afb4
font_01_sfnt_off00006de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE3 10640 bytes
SHA-256: 4e4482c6a5b90ee149e157ac7b936036da7ba7fcfd30d5a8710f122ae6daf2c8
font_02_sfnt_off00009264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9264 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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