Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c232d74ac2ddcd…

MALICIOUS

PDF

37.4 KB Created: 2020-08-02 05:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a51dd64cec7ebd14624e516bc5e526d SHA-1: 608bbffa00b3e72f51c747b724500d8c883fbe5f SHA-256: 83c232d74ac2ddcdbc7a05417dab7a8811200104e71685d0fcc0e2433d40c7d5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=assetto+corsa+database'. This indicates the document's primary purpose is to redirect users to potentially harmful content. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to obscure the malicious redirector. No scripts were extracted, but the PDF structure and embedded links strongly suggest a social engineering lure.

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.cc/pify?keyword=assetto+corsa+database
    • http://files.fortydollarserve.com/uploads/1/3/1/4/131452958/34eec6adbc6e.pdf
    • http://files.fauquiercommunityband.com/uploads/1/3/2/6/132682833/fabadipoxosiwis-lajadopefufivo-guxofaxena.pdf
    • http://files.santarosawineclub.com/uploads/1/3/0/8/130813325/xubavorovunulik-wamazolemi-pebox.pdf
    • http://files.holisticvieau.com/uploads/1/3/1/4/131455543/3804295.pdf
    • http://files.loansbybridges.com/uploads/1/3/2/6/132681164/4195ff.pdf
    • https://cdn.shopify.com/s/files/1/0430/7589/5447/files/8682462616.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/56491211663.pdf
    • https://cdn.shopify.com/s/files/1/0439/3664/5275/files/wuleluwusax.pdf
    • https://cdn.shopify.com/s/files/1/0432/6231/2616/files/telologexulokolelojire.pdf
    • https://cdn.shopify.com/s/files/1/0440/7027/3174/files/nakogev.pdf
    • https://cdn.shopify.com/s/files/1/0437/1585/4490/files/waxizovitarizufeweji.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/55234444348.pdf
    • https://cdn.shopify.com/s/files/1/0428/4973/0727/files/gisaluxe.pdf
    • https://cdn.shopify.com/s/files/1/0439/1839/3499/files/pikufuzafefubozin.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/15187292783.pdf
    • https://cdn.shopify.com/s/files/1/0431/4205/4048/files/fibebitaju.pdf
    • https://cdn.shopify.com/s/files/1/0433/1264/4251/files/visualizing_human_biology.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/wegefutevulufibadufowivem.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000535e.bin
46daed4c60e07070f6f00de355cc161ba0fc444141024ecde17dc33bea66aafd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x535E 5032 bytes
font_01_sfnt_off00006481.bin
828c4a97aaca42cac327e6be07bea91fe13e87f067488cec114084dc8b1c1a73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6481 11132 bytes

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