Malicious PDF — malware analysis report

Static analysis result for SHA-256 36590b4e0a969e85…

MALICIOUS

PDF

37.6 KB Created: 2020-07-30 11:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caf1a3a5844df748d58553e7edd2fed8 SHA-1: 061ca32a134c882910b8ae4212822be45602980e SHA-256: 36590b4e0a969e85448536a87a7b64652a9f7b8c93c14bb11eba9a5b2b17914e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The primary malicious URL identified is ttraff.cc, which is used in a lure for a PDF download. The ML classifier also strongly indicated maliciousness.

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=livro+antigona+pdf+download
    • http://files.susankong.com/uploads/1/3/1/4/131482931/zebevigusalerev-gagaruditegegu-lutebef-nukujip.pdf
    • http://files.idefirefly.com/uploads/1/3/1/3/131379115/sigukutidajit-tavofefujuraga.pdf
    • http://files.postfallsmusicacademy.com/uploads/1/3/0/7/130776594/kelufizunu.pdf
    • http://files.12monthbeauty.com/uploads/1/3/0/8/130874128/6301925.pdf
    • http://files.postfallsmusicacademy.com/uploads/1/3/0/7/
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/dowibitoroguwog.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7203/files/39828656610.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/kalojadesadi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7128/2079/files/vudavu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/79509070223.pdf
    • https://cdn.shopify.com/s/files/1/0431/5319/5157/files/80925995194.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/mepafevunomarinalaxupuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/mitokiluwodoxufasiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3820/files/rekuwolikazatij.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/zodofavaxitagexetuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/22294429494.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/53734075365.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/banefidofekadozimodomi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/45190797921.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/14316909376.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_off0000574b.bin
609ae63e1e2594c120dc4539d6a1339c6121738c8b576c579d10674f5b249430		 pdf-font-stream PDF embedded font (sfnt) at offset 0x574B 4796 bytes
font_01_sfnt_off000067b6.bin
8a555bcb029adfdea4b1afd5b3919e46f08700a3f5612f20392971a833eac21f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B6 9992 bytes

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