Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4ee7685f1a920c…

MALICIOUS

PDF

42.0 KB Created: 2020-11-04 08:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5cd835a3e8a93a8eaf445379605e0ac8 SHA-1: d11ac6a2fbe9a232991ad81074d6a9061cc854a7 SHA-256: 9e4ee7685f1a920c9fe64b7cf006f1f526fec8acd70ca32dd9f964192e91517e
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://cctraff.ru/aws?keyword=tekonsha+prodigy+p3+owners+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_5f9c3e45edfd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f9642d12c5d3.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/feee9600c1464f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_5f8cfb9cbd9b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_5f9abc3fb075d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_5f9c51b2d55f4.pdfIn PDF document text
    • https://rukiwopuxe.weebly.com/uploads/1/3/4/3/134340105/672563.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/kilug_mivizijabe.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/97ab539d-1701-422c-94bf-f6f1532cf303/download_free_amortization_schedule_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7603f0a-9804-414a-ba3b-f52ef7c3263f/57753201288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718aa783-69ec-467c-b357-efa720093f8a/nise_control_systems_engineering_6th.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81500156-6a97-4492-8fae-0efb54397303/new_year_chaos_hackerrank_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87ca77f0-7444-4bac-bd3c-2c4164fad114/14482904583.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/absorption_chillers_and_heat_pumps_second_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/livagugirilugipef.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FCA 5744 bytes
SHA-256: fe30b59382ca1016245b1883b49b269e5728cfa96d7239e8101d5433457d3986
font_01_sfnt_off00006346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6346 10180 bytes
SHA-256: 022561adfa1878b11a2c2414a9cde0dc90b4164acdbc468b6a5b8860ca4f3b3a
font_02_sfnt_off000085d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D8 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c

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