Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1783781c09d86f…

MALICIOUS

PDF

45.8 KB Created: 2020-11-01 15:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: dcffa40994f8053b13af7d4ac5330670 SHA-1: df300be8433c64daec896e96c15f74079b5a67c7 SHA-256: 1c1783781c09d86f8843275278c77bb13cc93a65d5eca4f7cc69036ce121d692
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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.ru/123?keyword=captain+marvel+full+movie+free+online+reddit In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f877b108e4b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_5f9a84a26a24c.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/pokizujopasese_zuvubafixuzube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5f9465bcae532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386354/normal_5f8fc46e5b925.pdfIn PDF document text
    • https://ratigejav.weebly.com/uploads/1/3/4/5/134576845/9059510.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/6379806.pdfIn PDF document text
    • https://rixokofumi.weebly.com/uploads/1/3/1/3/131380985/foninada.pdfIn PDF document text
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/xumavefodomagaw_vanogufuwarapo_nopokakakamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5f8d722954d04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jemazejodep/air_pollution_in_marathi_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/fogad.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/24965157177.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5065/5655/files/sikux.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/vocabulary_workshop_level_b_unit_10-12_word_study_answers.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 6

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D7 4972 bytes
SHA-256: fb02fb20f9b3be2b0305724526f1504dc90acdee881b6a59b78de70360db3947
font_01_sfnt_off000077b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77B3 10676 bytes
SHA-256: 1bc21ce1084a69ee7d6ea05c6423d1ad33dd4c325bfd396b96580df1d0cecdf8
font_02_sfnt_off00009bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BFA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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