Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb2495c76d7d11c…

MALICIOUS

PDF

52.1 KB Created: 2020-08-19 03:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f243b97fdc1838f257080e3bdd949f55 SHA-1: d2876c2d07989bfee7426a7717b0a8c83f2d9dac SHA-256: 3bb2495c76d7d11cabedc6d962f875492bd272792a673f578d0e48c880165b15
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised with keywords related to 'Miss Universe 2011'. The document also functions as a link farm, pointing to numerous other PDF files hosted on various domains, many of which are suspicious. The ML classifier strongly indicated maliciousness, and the PDF structure itself is suspicious due to duplicate object bodies.

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.com/pify?keyword=miss+universe+2011+question+answer+top+5
    • http://rolut.elevitated.com/uploads/1/3/2/6/132695569/purukeluxitaxit-wixunu.pdf
    • http://files.step-by-step-declutter.com/uploads/1/3/1/3/131398095/5903561.pdf
    • http://feroni.3am.ency-education.com/uploads/1/3/1/1/131164250/relobugut_vesosonugamopu_dakikule.pdf
    • http://kasal.evansalumni.net/uploads/1/3/0/8/130874233/4141256.pdf
    • http://fujobej.mikes-bike-shop.com/uploads/1/3/1/4/131482975/4945350.pdf
    • https://cdn.shopify.com/s/files/1/0435/8720/7327/files/bobbin_lace_books_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/7786/8443/files/80705184555.pdf
    • https://cdn.shopify.com/s/files/1/0439/0433/6027/files/79267649773.pdf
    • https://cdn.shopify.com/s/files/1/0434/1963/1765/files/free_templates_html5_css.pdf
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/steering_group_template.pdf
    • https://cdn.shopify.com/s/files/1/0449/2109/4311/files/59562868397.pdf
    • https://cdn.shopify.com/s/files/1/0436/0388/6238/files/faririgederul.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/54244805493.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/consumer_reports_black_friday_tv.pdf
    • https://cdn.shopify.com/s/files/1/0435/7505/0395/files/83540152744.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/43354432812.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7584/files/zobezapubefofisovakafan.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073c4.bin
c355344a3be9451aa0b4de01cd3a910a6ff2f7945e3807bdb3e39b82af9e0f6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C4 5396 bytes
font_01_sfnt_off0000863e.bin
b9b1dbf610792a13063bab2354a4e710d861243236e09da3d904c316c11af97f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x863E 2392 bytes
font_02_sfnt_off00008fba.bin
5bdd347b01a19077891131ba27fffbe3d08462714d50034456cfbb4b4e17d83a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBA 10740 bytes
font_03_sfnt_off0000b44e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB44E 4324 bytes

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