Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f81d1372968afd…

MALICIOUS

PDF

42.5 KB Created: 2020-08-05 04:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27e02f4f9792baa48a69299070a38b76 SHA-1: 560cafeb060c015428efb5db76bebe6ee4151aed SHA-256: 08f81d1372968afdf43cf60f5d26c929e492f5780cafccb3c10377ae8694d8ec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically a URL associated with a redirector. The document body, though obfuscated, contains text suggesting a lure related to loading an image, which is likely a pretext to trick the user into clicking the malicious link. The presence of a large number of external PDF links further indicates a link farm or SEO poisoning attempt.

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://ttraff.ru/pify?keyword=imposible+cargar+la+imagen+html2pdf
    • http://files.nhnymusic.com/uploads/1/3/1/3/131382092/ketulisikaxegu_vozoles_vetasesez.pdf
    • http://files.singingsabercats.com/uploads/1/3/1/4/131482991/8888788.pdf
    • http://files.kenlevyskickboxing.com/uploads/1/3/0/7/130776272/xuxawevufi_minawo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rikakaxudote.pdf
    • https://cdn.shopify.com/s/files/1/0436/0693/3661/files/87177978631.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/39935475947.pdf
    • https://cdn.shopify.com/s/files/1/0434/5754/4342/files/95109894039.pdf
    • https://cdn.shopify.com/s/files/1/0437/1483/8679/files/bajawujavigigufile.pdf
    • https://cdn.shopify.com/s/files/1/0439/3834/9211/files/windows_defender_exclusions.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/50479375461.pdf
    • https://cdn.shopify.com/s/files/1/0430/8638/1210/files/wipubewunuva.pdf
    • https://cdn.shopify.com/s/files/1/0428/5644/8156/files/zurarunojiworidaburofana.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/59445365001.pdf
    • https://cdn.shopify.com/s/files/1/0435/2809/3850/files/vevipetisepezobewomuvipe.pdf
    • https://cdn.shopify.com/s/files/1/0434/7022/5574/files/fourth_definition_of_acute_myocardial_infarction.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054e6.bin
dc1207e7fb3f7c272c1b5d90c6daa676620f94fe598851f2be92f0122c1790bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54E6 5564 bytes
font_01_sfnt_off0000678e.bin
57a3ef308b92e1e4ccdf2056068cbdd939e666eeec226c90019a4b8351899390		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678E 11584 bytes
font_02_sfnt_off00008d89.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D89 4324 bytes

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