Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09b2fc0ee28fdd6…

MALICIOUS

PDF

40.9 KB Created: 2020-10-29 23:23:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 36d4a26a9d346e9ecfeae2f7711161c3 SHA-1: 3244d579e72ad3bf6619446aace59ae9dddbc3f7 SHA-256: f09b2fc0ee28fdd6494c99c834bac45c47d83a76de3d29688ab8de333eb9bdd2
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to drive traffic to potentially malicious sites.

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=palm+beach+central In PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/958736.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/0cbd7f35736ab.pdfIn PDF document text
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/7494562.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/lanogopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384470/normal_5f91f5b18d39e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5f93792156eb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/dofagap.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/297003925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d86605-38b5-46f6-9fe4-690f7e999d67/salarma_yldz_dm_koparma_anne_indir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/8002/8838/files/declarative_and_interrogative_sentences_worksheets.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_off00006163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6163 5000 bytes
SHA-256: 5d143abd42a471b681f9e5a942bc8cea2e92649917aa48e3d5f6c3f73a6b116a
font_01_sfnt_off0000723a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723A 11248 bytes
SHA-256: 84204ce46fcdb416832cd146d810114b71c349ce3794d0de8cb364317427702b

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