Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f84e9acc24b18f3…

MALICIOUS

PDF

42.1 KB Created: 2020-08-04 10:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ec178c245ec19009dd78510b8a20f14 SHA-1: e5ec345c801dd5e535fc454591262d79eca9793a SHA-256: 0f84e9acc24b18f38cddf2131c6dce07b69c06d6b3d07ec691a2b5a4ab372d2a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary redirector URL identified is https://ttraff.ru/pify?keyword=calculo+de+centroides+de+figuras+compuestas+pdf. This indicates a phishing or scam attempt leveraging a link farm to obscure the final malicious destination.

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=calculo+de+centroides+de+figuras+compuestas+pdf
    • http://files.nmakzoo.org/uploads/1/3/1/3/131381900/6261918.pdf
    • http://files.futfemuniversal.com/uploads/1/3/2/6/132681156/4129992.pdf
    • http://files.carolinastormhedgehogs.com/uploads/1/3/1/3/131380616/797545.pdf
    • http://files.leannejohnston.com/uploads/1/3/0/7/130738971/be70e888f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9235/1907/files/dovumaxokubiki.pdf
    • https://cdn.shopify.com/s/files/1/0451/0928/0933/files/companion_to_analytic_philosophy.pdf
    • https://cdn.shopify.com/s/files/1/0428/7420/8415/files/movokap.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4440/files/boxemov.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/dadafilesojeno.pdf
    • https://cdn.shopify.com/s/files/1/0432/5464/4894/files/42150441728.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/78488544627.pdf
    • https://cdn.shopify.com/s/files/1/0436/0749/0717/files/hampton_bay_ceiling_fan_replacement_parts.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/59556640295.pdf
    • https://cdn.shopify.com/s/files/1/0437/4780/3287/files/budget_proposal_sample.pdf
    • https://cdn.shopify.com/s/files/1/0427/6014/3014/files/55549701467.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/kayla_itsines_workout_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/pomidanotololiwarimud.pdf
    • https://cdn.shopify.com/s/files/1/0434/2035/2677/files/19328050107.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062b2.bin
8b8bda0c036d3a4d0a08933fe81386ac6d1fa9db08c647011abefa86d1f30cbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B2 5380 bytes
font_01_sfnt_off000074e7.bin
408946157cb0815611f5846016381a19b94d85a0968fa74f32a501185e9da4fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E7 11072 bytes

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