Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb8bab86be75993…

MALICIOUS

PDF

45.2 KB Created: 2020-11-07 11:07:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ca266051867655d1afbd009d17b819d7 SHA-1: 82bd128d1db488a61f8d716c36781ecd3794d825 SHA-256: 5cb8bab86be7599388f6e83aa39888982a6b67761f1705286ad79655b28c694f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'colonial american jobs worksheet' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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/123?keyword=colonial+american+jobs+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368496/normal_5f9459d697aed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408593/normal_5fa3cca790f8d.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/055a63e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460970/normal_5fa15229abf63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5f8d06eca92a5.pdfIn PDF document text
    • https://xazotanosiwe.weebly.com/uploads/1/3/4/3/134314219/pomilukozexuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404987/normal_5f9fb867d8f72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_5f96e73c3e73c.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/dinigugaxej/29846859476.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/17960135982.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/66483429809.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/dejimagesizazen.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/undertale_secrets_wikia.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_off00006ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC0 5316 bytes
SHA-256: 5e4c3e4a4ada9c3406e94e6d475820aa934a85d0e221e61bb9e2f49651ada6c4
font_01_sfnt_off000080b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80B2 11580 bytes
SHA-256: 2f2dad81a039ad861c3b8f4c26f9ad8bfd0ef3006990776bbb4eb9c6ed88f42b

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