Malicious PDF — malware analysis report

Static analysis result for SHA-256 710527928d97c54c…

MALICIOUS

PDF

50.4 KB Created: 2020-08-11 17:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9eda6df77aeb09c718232633d62b43f9 SHA-1: 9dfde1ffe09cb89fa2283aa46cef73e5e320bacd SHA-256: 710527928d97c54cef78df33970ece55c4efa52d240154a055e3272a01d10fa3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are part of a link farm designed to appear as legitimate content. One prominent link, disguised as a search for "causes of global warming pdf", redirects to a malicious URL (https://ttraff.cc/pify?keyword=causes+of+global+warming+pdf). This suggests a phishing or redirection attack aimed at leading users to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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=causes+of+global+warming+pdf
    • http://files.lidiarussellphotography.com/uploads/1/3/0/8/130814110/peged.pdf
    • http://files.fenlandfives.co.uk/uploads/1/3/0/7/130775633/8834654.pdf
    • http://mubuz.westspringfieldbouncehouserentals.com/uploads/1/3/0/7/130776542/laribafupowak_jigigexid_medimubadosug_zibax.pdf
    • http://bosizefat.centralmarylandweather.com/uploads/1/3/1/6/131637649/wodavarimijovobig.pdf
    • http://nikoxexez.drbrendaeabbey.com/uploads/1/3/1/6/131637254/pegejedodulapalu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1042/4985/files/xedimitekotaxapenemido.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/algebra_1_practice_exam.pdf
    • https://cdn.shopify.com/s/files/1/0429/1300/5724/files/basics_of_c_programming_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/4015/1454/files/50085892147.pdf
    • https://cdn.shopify.com/s/files/1/0436/9258/9210/files/brilliant_pala_screening_test_2020_question_papers.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6191/files/16576912185.pdf
    • https://cdn.shopify.com/s/files/1/0433/8139/1514/files/50274560430.pdf
    • https://cdn.shopify.com/s/files/1/0428/2194/3463/files/10312929174.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1320/files/tamifadepofamusa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7349/4430/files/92893598952.pdf
    • https://cdn.shopify.com/s/files/1/0438/8388/8808/files/27439325960.pdf
    • https://cdn.shopify.com/s/files/1/0433/9495/7470/files/selogowaxefexawasinarojul.pdf
    • https://cdn.shopify.com/s/files/1/0430/9775/1709/files/fobotusobitonotujimabupag.pdf
    • https://cdn.shopify.com/s/files/1/0435/3366/4420/files/fapidam.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/6_pillars_of_self_esteem.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_off0000867e.bin
e3ec7493a1ed0c53b832377af205cc137a28cf4e3b83b199002bff1f155eb3ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x867E 5500 bytes
font_01_sfnt_off00009926.bin
2226f0ae10e5498306a133453c0a9adcb66ae001c04f9a59704c0c866380c0c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9926 10256 bytes

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