Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd24d6b6fd5e5d1…

MALICIOUS

PDF

85.9 KB Created: 2020-11-04 05:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8ecda4fb5205e6920d5680266a164d38 SHA-1: 843ad86449f29c41324d87b5aff956d9b908c44f SHA-256: 4cd24d6b6fd5e5d1313b2e0cd76910bab0a4ea48bbb694c0eb33d5ddd4438d03
154 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 0.9999

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://gettraff.ru/aws?keyword=ridgeview+middle+school+clintwood+va In PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/6315655.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/wodajomabif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_5f9a59804f87b.pdfIn PDF document text
    • https://vidigesiwixir.weebly.com/uploads/1/3/3/9/133997627/wikusuvema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5fa0a0194c685.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/tixiw.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/nuwelurinemu.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/marathi_barakhadi_in_english_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/kafasotew.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/cylindrical_roller_thrust_bearing_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/mukilamigim.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 5416 bytes
SHA-256: 2422c57d4eaeef4d1e0432d2d2bc7d2a5735225786afa5d2c7199b9cb0d29f0d
font_01_sfnt_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0000fe23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 10672 bytes
SHA-256: f0b0bff956981071bc69009a5e64689d012ef593c6e2a422a90a9dedcdc6bdef
font_03_sfnt_off000122b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B0 12884 bytes
SHA-256: 7ed8ab4a2cd8737b54b358f235a39d76662445239c16182ca28afe4eef892597

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