Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27aea75b1eb46a7…

MALICIOUS

PDF

42.3 KB Created: 2020-10-30 15:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 46b8d1ec73a7a1ee746852346f3d4c15 SHA-1: 1296167e284db2d678d6371ee68d96893b23d828 SHA-256: f27aea75b1eb46a766fbe87b67f80d60bfd9fc36a6c1299bcf42c2a5f681f087
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One prominent URL, 'https://gettraff.ru/aws?keyword=java+j2ee+interview+questions+pdf+k+arulkumaran', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is part of a campaign to redirect users to malicious infrastructure.

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=java+j2ee+interview+questions+pdf+k+arulkumaran In PDF document text
    • https://cdn-cms.f-static.net/uploads/4428035/normal_5f98d3db5c004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370762/normal_5f9678c5783bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_5f94e9acdb7f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5f8d58d1637ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415748/normal_5f9a6b41d2040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5f972f615102a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410717/normal_5f95c72419005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_5f9a6a07bd4c4.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/zufaxepixiguxax/jajewogiwewigevixarosed.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/55582697031.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7386/3842/files/36851908228.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/kofuvudadonofomipaxemisu.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/stony_brook_spring_2020_deadline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7190/4673/files/tobunefa.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_off0000642e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x642E 5728 bytes
SHA-256: 44c5db2a72c8f06eb9fbfa77858279cc902b0d45614192b25f408b4a789c189b
font_01_sfnt_off000077c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77C1 10724 bytes
SHA-256: 710de7f6ac71aa4da25b390902792c1b231b143cc8f5f04481938be0cdb174bd

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