Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6a681d3386091b…

MALICIOUS

PDF

42.5 KB Created: 2020-11-04 19:34:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8b7d08b1e15a5dda4001b0d51be8c7cb SHA-1: 2b9d2a76912d5548c08f7a2fa537d1cac1798a8a SHA-256: bc6a681d3386091b76c22787a170275af2c4fa577f930c2ca563dcbf512ee9df
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector. The document body and embedded links suggest a lure to download free PDFs, which is a common tactic for distributing malware. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector and a link farm.

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.club/123?keyword=living+religions+pdf+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391624/normal_5fa26652260b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f89d16e55761.pdfIn PDF document text
    • https://sivusemekatew.weebly.com/uploads/1/3/4/4/134491367/ripaserijazuruvojup.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/memul/jitutomuzotademokuzojilun.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/79522807023.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/kufadedoguzaluvanosi.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/robin_williams_inside_the_actors_studio_hernia.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/13131685951.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/wubedutifakiguzisaras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72763071-8562-4c1b-9b84-0b5e17af11ad/65212277695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2d1bb5-7c6e-42cc-a430-7ead28250c11/sijanavukudezujixaviteki.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/pamimojizesuvixonoku.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/kerbal_space_program_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/94448213771.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_off0000696d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x696D 5000 bytes
SHA-256: 65d4cef672964cdccfc3e4d928c2b4ba970657654b187aae2ba1fd4be5244736
font_01_sfnt_off00007a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A97 10224 bytes
SHA-256: 724b44e3f24ba5c142c7dfa1be43c958e58d00b8b058c0f7ec6d2564bae66b58

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