Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb18968a9a3da112…

MALICIOUS

PDF

48.2 KB Created: 2020-11-03 01:24:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b880a18479dd9b2b6ea93a0f639a59c5 SHA-1: 967fbccc5d369103be55a346ed19f9221a07fe35 SHA-256: cb18968a9a3da112fc6659a90d8b32441e728e5f72a4e4544a1f217d3fa90ee9
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one critical link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to redirect users to malicious sites, potentially for phishing or malware distribution.

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://cctraff.ru/aws?keyword=sites.google.com+sign+in In PDF document text
    • https://jijibaduwa.weebly.com/uploads/1/3/4/4/134495912/xemenilikizo-giwabinetejozeg-wazuripenerebam-jusejipan.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/3fba6d910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_5f9d13c987cec.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/katemofiseturoj_lakagez_kunajomeba_tajofe.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/rebodi.pdfIn PDF document text
    • https://dewisepiremutu.weebly.com/uploads/1/3/4/3/134318599/4583446.pdfIn PDF document text
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/3477553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f8782c96f9f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1861/5449/files/diferencia_entre_celula_eucariota_y_procariota.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/1272/4138/files/ms_224_bronx_ny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d75a77-0beb-4b6c-b98a-fb818c2a5390/68969072124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcd39acd-948b-46f0-a64a-5dff2d6a9958/cold_war_worksheets_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd4be991-dbe4-4317-829f-c36db312beb3/john_phillips_commentary_series_set.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_off00007eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EBA 4948 bytes
SHA-256: 6704fd4fe91f73c785ae96acbb8568097e4a31fa7a0811554b8f6fe785a7438c
font_01_sfnt_off00008f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F90 10592 bytes
SHA-256: dd08dccf9a10193dd7748f564a88d7c1b235e695d791338a81bf2d3bed7e6128

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