Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c7fe683ef7d0d8…

MALICIOUS

PDF

40.5 KB Created: 2020-11-03 12:18:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0e9b0cacaea7b614ccf0b8643ceacd3b SHA-1: d7cdd6e93d28e857258d02eab340b803b68c1374 SHA-256: a9c7fe683ef7d0d87a91905a339ee270e65d8e18420ccb84870da4d7d5649e09
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://ttraff.ru/123?keyword=monster+arena+ffx In PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/xasegufenexe_divon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_5f9cb8c6ec2fd.pdfIn PDF document text
    • https://rezivunafotete.weebly.com/uploads/1/3/4/3/134354631/3131075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5f95698f0e616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_5f9de41e10fc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413838/normal_5f98fef5a3660.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/tojodepizaduka-wilijabob.pdfIn PDF document text
    • https://gizukazirup.weebly.com/uploads/1/3/4/4/134443136/gevafefuzuripinefem.pdfIn PDF document text
    • https://dexixafavako.weebly.com/uploads/1/3/4/3/134348567/dojofal_kemasolu_lidekan_nesavivawakod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_5f93fe9e11375.pdfIn PDF document text
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/nokutexa.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/1/0445/7742/3560/files/157cm_to_inches.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_off00006042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6042 4800 bytes
SHA-256: c8a46bc7f7fda1f54c17b51c44c95dfdfb50ab91a017996f1ac3bf5786d4b027
font_01_sfnt_off000070b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70B3 11000 bytes
SHA-256: 3aa2b1c848c1e32b8928b72782fca6bec32bd2e516c2cfdd4760a221006f07d6

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