Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac9a58f8a307ec3…

MALICIOUS

PDF

53.3 KB Created: 2020-09-11 15:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00dffff05b23e4a4a118ae84c4373320 SHA-1: 69d6a57171cd754bda1c95bbb579153d64784eec SHA-256: 0ac9a58f8a307ec3931808e05d49739842bb6f7f981570394beca71a26aca5e4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDFs, suggesting an attempt at SEO manipulation or a link farm. One URL, https://ttraff.ru/wb?keyword=norma%20oficial%20mexicana%20037%20dislipidemias%20pdf, is identified as a malicious redirector. 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.ru/wb?keyword=norma%20oficial%20mexicana%20037%20dislipidemias%20pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8135/1839/files/pharmacist_clinical_informatics_duties.pdf
    • https://cdn.shopify.com/s/files/1/0437/4865/5265/files/56583220697.pdf
    • https://cdn.shopify.com/s/files/1/0460/3346/9604/files/78008342163.pdf
    • https://cdn.shopify.com/s/files/1/0429/6992/3740/files/raluxoxewizodanepeze.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3566/files/3322253705.pdf
    • https://static.usrfiles.com/ugd/822ecd_6f974c696de442a79e80171df450d3cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_6abd73b545414893bd8f5d5b3e9c24cd.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_a3614949d7424d09b24da823159fd1fa.pdf
    • https://static.usrfiles.com/ugd/bcd086_bd18614aa0c043e383bcad6d5c017d57.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/suzafazobe.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/97984092692.pdf
    • https://cdn.shopify.com/s/files/1/0435/5214/5560/files/63433607732.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0865/files/76971710073.pdf
    • https://cdn.shopify.com/s/files/1/0435/2920/7957/files/national_immunization_schedule_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/4749/2506/files/geology_terminology.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/vafogatitoxejibit.pdf
    • https://cdn.shopify.com/s/files/1/0461/9540/9054/files/android_draw_gradient_rectangle.pdf
    • https://cdn.shopify.com/s/files/1/0465/0139/6638/files/renewable_energy_sources_book_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c02.bin
e92e418954802d5a36e36d4c16fd57612b19706387c7103a2bf60f3a1cc78f9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C02 1712 bytes
font_01_sfnt_off0000844a.bin
43124d7feb4f98fe298b700fac18be165255c203cd82d3de11cff097bb9384b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x844A 5724 bytes
font_02_sfnt_off000097bd.bin
9e5cc58ed62ec5d9136d5ca91e77a518396066955640dd13c879cf3a393c01fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97BD 14932 bytes

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