Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7f4e269fde6a97…

MALICIOUS

PDF

47.2 KB Created: 2020-10-21 02:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 28712cc358b828d43835095d72ca18f3 SHA-1: 43d0e283a1311b14bae56295c85331667fd01cd7 SHA-256: 7b7f4e269fde6a9772f74fc8dbc802848f43533f6e4d7686129f33f15900bf86
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign-looking documents on S3 and Strikingly. However, one critical heuristic identified a link to known malicious redirector infrastructure at 'https://gettraff.ru/wb?keyword=c%20templates%20the%20complete%20guide'. This suggests the document is part of a link farm or SEO poisoning campaign designed to redirect users to malicious sites. No scripts were extracted, but the presence of malicious links is sufficient evidence of malicious intent.

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/wb?keyword=c%20templates%20the%20complete%20guide In PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/bomasoxitav.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/9031774.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/vevuxa_begebodasukevu_movaxumage_xobamovif.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/jamokaroxoj/ammonia_gas_sensor.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/libegusufagaguvazowasa.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/parametric_and_nonparametric_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfd5100d-9c71-405c-8401-3b17803b9020/turuzegovobomixuzidazan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b234d85-b2c9-4f42-9ae8-68c4409010a5/xixafajogul.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/mekujefakizamekuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/joint_of_multivariate_normal_distribution.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/58932034354.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cffc5e8-dfca-4b99-869d-8069d58d9ac2/tuzixuzenipirurem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b0fe4c-edff-4382-8a5d-e4addcb32ef4/pivakelegawofolujarim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e74bf7-776f-491e-aff0-c36f51810988/58185169299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0615e2ee-70e0-46cd-8aab-52324c57874a/19494322532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c92d53e-4c1a-47c0-be97-dee1495fba10/wefuninuladusodudotuloj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e67584-a263-4a4f-a9cb-6bccea84be2d/kizomuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470f0f05-5bac-4973-b95f-bc35197e039e/56199110355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efa05928-db62-4346-aaf7-f5f9cf102d90/lenujalaz.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_off0000795e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x795E 5296 bytes
SHA-256: c294228b565bf9fc01e31a0fbf133024698f67b21753789ff0d2b9e0abe9c158
font_01_sfnt_off00008b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3C 10764 bytes
SHA-256: bc34058b40c007131c4665075df82202ec3e74e30eb4de54e1edd946adb3df0e

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