Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b0996693d9e4da…

MALICIOUS

PDF

73.2 KB Created: 2020-10-30 10:07:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9a9427301210a9f1787d60bdb4f2d039 SHA-1: 1605c0d98c3fd3382c6841b8cc02a23e8d87bc0e SHA-256: c2b0996693d9e4dacee42ee066467fc18bad739cee8f01a371644b9c74dc6fb8
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://gettraff.ru/aws?keyword=c%2523+hello+world In PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/c25f730.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/d40be96e-7c58-4202-be9d-6b59a5c3a230/xaxavutu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/2127/6587/files/37119225043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ae7054-0534-4761-8788-a51eb59643ea/sexejebuzesiwupilezaguzox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/8251/2052/files/scansione_antivirus_online_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca2d556-c139-4063-995f-b0396a7d5139/xevivetafekapitumevona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a0262ea-2daf-4e97-92ff-d80d0b1dfa80/33014140719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f8824cd-48ed-4f88-8e78-8d9c8fff4c19/french_language_survival_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2680/8473/files/allison_transmission_fault_code_p0842.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6488/5397/files/camera_test_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/079202cc-d5b6-4b3d-b2a7-e397fe7faed3/pimebivununovalatazorilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/502ac15a-1b93-4530-a033-90f565cececb/35416436419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6bd896-8cd3-4574-afef-061deee8b548/ruzes.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E7C 4064 bytes
SHA-256: f2ff66d66510a0458830129880aede76436f842d918f407c0ced0894d2af59f2
font_01_sfnt_off0000ac42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC42 2516 bytes
SHA-256: b585bfd10dbd7c712755632dd27f4e7e7d74e560ec1094940c4338282c8ab44c
font_02_sfnt_off0000b793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB793 19780 bytes
SHA-256: 57fdd7174343bf5e7ab5807811ea0d1cb82c052f1e749de43a24793c7fc710fa
font_03_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 16736 bytes
SHA-256: 60a7f6cc46506e74a6f9b4da5862087b38b5171f8114cebfd49580ea995127d9
font_04_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 6092 bytes
SHA-256: f3835c9f82e8470a7cb724a1be4643edb2dafab8f05d1721ddd8324b8cf769f7

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