Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b198c350cf67b9c…

MALICIOUS

PDF

43.4 KB Created: 2020-11-09 02:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 686534bb48c14699e141eb6e75df043c SHA-1: 1c6da42132bf4c1daff50ec7ac45338ac2726019 SHA-256: 3b198c350cf67b9c3bdaba31d442d22bf93d79b1a9c1a785cd6d5ced4771c4a4
124 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 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://ggtraff.ru/123?keyword=musically+app+free+download In PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/9ac999dfcc.pdfIn PDF document text
    • https://xirofepomare.weebly.com/uploads/1/3/0/8/130814083/6615089.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e3e420d-0067-4349-9f8d-1326ed3c43a8/wutuxogero.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/marcus_aurelius_philosophy.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/50939477702.pdfIn PDF document text
    • https://rejuxakol.files.wordpress.com/2020/11/74629528503.pdfIn PDF document text
    • https://sezikurovo.files.wordpress.com/2020/11/wedding_march_easy_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/xowogaverikuraluzipek.pdfIn PDF document text
    • https://xobumili.files.wordpress.com/2020/11/maitres_pressure_cooker_manual.pdfIn PDF document text
    • https://fobonova.files.wordpress.com/2020/11/mahindra_tractor_parts_catalog.pdfIn PDF document text
    • https://rotadenig.files.wordpress.com/2020/11/82236523173.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_off00005f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F15 5348 bytes
SHA-256: 6957630399032fa19f70d1a14360a6772888ba8ec94ec038ebee0c10df75d339
font_01_sfnt_off00007173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7173 2140 bytes
SHA-256: a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b
font_02_sfnt_off00007b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4B 10924 bytes
SHA-256: 9724e4bd6008480de262db4ed0f26a13d503b25c050e1f78d3fbe0ae2146aa67

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