Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72df50af343528c…

MALICIOUS

PDF

49.1 KB Created: 2020-10-31 13:49:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5811010af9f1a6b53a3ed90b19d45e34 SHA-1: 23498cbf34e2c5faa7f7ac43036cdef068595aea SHA-256: b72df50af343528c5e0f8a844eed6c5620d75b560e4304f02d1c6f7cc04abb45
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/123?keyword=room+of+ones+own In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417429/normal_5f9d0eb030259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_5f95135fe7d58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388276/normal_5f9cfdc9dee83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_5f96fbbf74d49.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/dasowigupuduzegi.pdfIn PDF document text
    • https://guxolufesa.weebly.com/uploads/1/3/4/4/134468064/9778488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_5f96a5a119244.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/1/0504/9499/6635/files/falipo.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/mitochondrial_oxidative_phosphorylation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/wekemazerezituxid.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/fajeweru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8104/0033/files/marie_mjolnir_age.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/2230/0348/files/getujagudigokimufe.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8171 4676 bytes
SHA-256: 3e9c4db020aaea12bf131175e102a2a661a5ef1c824f01a50bf98d0066582ea8
font_01_sfnt_off00009162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9162 11288 bytes
SHA-256: 2721e1495b5392a1281ac2a0e47efa650aa96cf2e21860a49284185ba6c36942

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