Malicious PDF — malware analysis report

Static analysis result for SHA-256 674bd3161f536dfe…

MALICIOUS

PDF

52.1 KB Created: 2020-11-04 03:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 01829a96bdc962d1438fc94af557df7c SHA-1: df50ce11ca9db16867227c5dcc4fff94ce43af92 SHA-256: 674bd3161f536dfe58b39cf4cce2076ba379dd485864cda1de321a5f2d6abbb1
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is used to drive traffic to potentially harmful sites.

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=1953+cadillac+fleetwood+weight In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_5f96c74044412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5f92f9629c239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_5f89351c9feda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_5fa07c78ab2c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_5f89cdc548fb2.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/negila.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/salosibejodod/bioplastic_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/tudovona.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/sipamenoverav.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/mini_head_soccer_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/libros_de_ana_catalina_emmerich_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/vokadijogotokagizufibu.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_off00007712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7712 5500 bytes
SHA-256: c736acb62ae5b089023e9e51cf6069d42fb86c13549dccc71652cce9c8bf7127
font_01_sfnt_off000089e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E4 10524 bytes
SHA-256: b49437ba8ee16d8f599d93441360df51b504c4efa09b8edc343426e5f4cec701
font_02_sfnt_off0000ae5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5B 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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