Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f30a2fba7cfbcb…

MALICIOUS

PDF

33.8 KB Created: 2020-10-02 04:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a35eea4459f10300e1c9193d7ae2fadf SHA-1: f08f407f4248bbb34d8d16ea5403c5f6494858dd SHA-256: 38f30a2fba7cfbcbc5462bbe8dbe4dc89053fdb0298ae79577399f2e54ffd454
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the document's structure and embedded URLs suggest it's designed to lead users to potentially harmful content or further 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://cctraff.ru/pify?keyword=the+norton+field+guide+to+writing+4th+edition+ebook In PDF document text
    • https://site-1038493.mozfiles.com/files/1038493/90666455405.pdfIn PDF document text
    • https://site-1036926.mozfiles.com/files/1036926/42141981726.pdfIn PDF document text
    • https://site-1037283.mozfiles.com/files/1037283/kejumebubulufimomi.pdfIn PDF document text
    • https://site-1038471.mozfiles.com/files/1038471/kozaral.pdfIn PDF document text
    • https://site-1036823.mozfiles.com/files/1036823/kebazeni.pdfIn PDF document text
    • https://site-1037120.mozfiles.com/files/1037120/gezidewili.pdfIn PDF document text
    • https://site-1037122.mozfiles.com/files/1037122/lavinazamenedanel.pdfIn PDF document text
    • https://site-1039765.mozfiles.com/files/1039765/begurelomotutob.pdfIn PDF document text
    • https://site-1036935.mozfiles.com/files/1036935/ripulojarosezo.pdfIn PDF document text
    • http://files.leopardpineapple.com/uploads/1/3/2/6/132680926/6394514.pdfIn PDF document text
    • http://files.achildsworldtherapy.com/uploads/1/3/1/6/131637308/bekemupezotisel.pdfIn PDF document text
    • http://vilikulop.hscte.net/uploads/1/3/0/7/130775403/8b038.pdfIn PDF document text
    • http://sugula.tfpoist.com/uploads/1/3/2/6/132683041/1901712.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/1/0479/2687/0172/files/26061495467.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1634/2682/files/motorcycle_highway_pegs_with_heel_rest.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_off000047b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47B3 5116 bytes
SHA-256: 08c4e67c88eeb66e43526a578fd2b35d8721c57af1ae14d07030bd38415e2de6
font_01_sfnt_off00005928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5928 9576 bytes
SHA-256: 2903a4e40776c2f7ea3427080bdf471fd07859941b89347184f95d85d45f1a71

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