Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b0c7363eb804f3…

MALICIOUS

PDF

39.8 KB Created: 2020-11-03 15:07:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cb7e5b52a1dd59db17f70683e45e312b SHA-1: baacae014ac60d315071ce3e5a23c78d381c404d SHA-256: c8b0c7363eb804f3ac47c861d5aac4fb925be8324c7509a2869a2bc9fb85c08c
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ggtraff.ru/123?keyword=how+do+muscles+work+in+pairs+kids'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to lure the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/123?keyword=how+do+muscles+work+in+pairs+kids In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5f93c953a9461.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/bisegilupuf/what_is_capa_certified.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/stihl_bg_50_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13dc8dee-47f9-4ce0-8c8c-29479391e787/dizuxopilakifilaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3c0cb6-3f37-442f-9092-c8a159819891/kim_su-ro_the_iron_king_mydramalist.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/58219246343.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/fubitokimi.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/nudovewobovolexune.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/folexurikisibagirenuwoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a60a37e-1ecf-4aec-8252-139b6d951c89/36249549117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e679c4-e379-4eb2-8890-e1e86a14812d/druid_wild_shape_list_5e.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/pokubejagosopanut.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_off00005b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B59 5336 bytes
SHA-256: 4790d84226ccbd91f926def13d44e543f05030a19ad691403f74d53ae356853b
font_01_sfnt_off00006d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D75 10944 bytes
SHA-256: b6b616dd2a259feb05614abfc506cf26f1d8224f8af6a8c3ca39d872392477e5