Malicious PDF — malware analysis report

Static analysis result for SHA-256 9daf4bd29e967be0…

MALICIOUS

PDF

41.6 KB Created: 2020-11-01 06:59:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7bfd45a7878c135d3afff72ec3d19a8f SHA-1: 304c311e7352327f55152fe16cb31869c92374f2 SHA-256: 9daf4bd29e967be0a9e4b20f1ecfb1d267ca2bf208458df29f858b5a086eea4a
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ggraff.ru, which is likely intended to lead the user to a malicious site. The PDF also contains a large number of external links, many of which are likely part of a link farm. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this assessment.

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://ggtraff.ru/aws?keyword=minecraft+replace+command In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5f9167981d6c3.pdfIn PDF document text
    • https://kudizuvawemexol.weebly.com/uploads/1/3/4/3/134307781/bewiwarufekidilebud.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/rovusuwu_bimuwuxilewivug_sekadelulakara_dafezurajejijat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_5f91faac74f0a.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/58c505bf-c718-4d44-a5b3-378de79e16bf/gupinum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8824/7482/files/tumaxomof.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/15908563418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c03dcbbd-adf5-40a1-9d0f-d4df255e271b/street_king_energy_shot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3663608c-f212-47e4-8dc2-92b87f008cf6/63732828673.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7890/0640/files/graphing_inequalities_in_two_variables_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/62179508404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8404787a-f1c6-472a-8f40-f7d769208776/83533153480.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_off000062c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C4 5128 bytes
SHA-256: 68cf24bacfb59b255e7aad6012555f0b6476f97f131ffc367479525a4212f40b
font_01_sfnt_off0000742d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x742D 11212 bytes
SHA-256: 4e96771c1da913d99a1d6b282dccafffbedd72ec4704fae68857e83c1c91df8e

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