Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a97056670c9fdbb…

MALICIOUS

PDF

35.7 KB Created: 2020-08-30 12:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c128d4d259737032822a2653378a1a52 SHA-1: c0b14c8afb1b6afc424bcc3bca7c801a63ef8c65 SHA-256: 0a97056670c9fdbb7b868b70b1167acad15155d1dc8c87e3c907e63a9981a766
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a direct link to a malicious redirector, disguised with keywords relevant to insurance searches. The ML classifier strongly indicates maliciousness. The document body and embedded links suggest an attempt to drive traffic to malicious infrastructure, likely for further exploitation or phishing.

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/wix?keyword=aaa+insurance+monroe+mi
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7940/1623/files/87738762551.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1722/files/describing_words_for_school_reports.pdf
    • https://cdn.shopify.com/s/files/1/0429/4361/1036/files/sample_cover_letter_for_job_application_bd.pdf
    • https://cdn.shopify.com/s/files/1/0439/4093/7896/files/52957676494.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdf
    • https://static.usrfiles.com/ugd/b3bc21_923d6b75509a4bc0be71f2d8d6bd0c60.pdf
    • https://static.usrfiles.com/ugd/cb5dea_942e7c4d08734f31be57659ec454890e.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9b01d07d95c4b9e85287a58ed98cc9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_423da957b24945749e3364e832b5d02a.pdf
    • https://static.usrfiles.com/ugd/5e8de6_8bf64a23405340778944a9e671358b99.pdf
    • https://static.usrfiles.com/ugd/5ed537_01dc9328af28469ca9f53605d0c1143f.pdf
    • https://static.usrfiles.com/ugd/09273f_b75fccaded92493ba66d2fcd83ba99a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_208b6b9e66bc4a1ba5edfd7a15364afd.pdf
    • https://cdn.shopify.com/s/files/1/0430/8697/1029/files/seattle_seahawks_injury_report_week_9.pdf
    • https://cdn.shopify.com/s/files/1/0435/2845/4298/files/lesson_of_passion_teachers_pet_walkt.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/difavojunenubazurum.pdf
    • https://cdn.shopify.com/s/files/1/0433/7260/9686/files/jazulosufegajolufu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9992/1315/files/vubawidodizido.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_off0000500b.bin
9481feee71027a2e65a7504a67a650c62b0d7ad94c91d6d6b6279994240a1b6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x500B 4900 bytes
font_01_sfnt_off0000608e.bin
eceb121ddde48894a191d3b8863c54eef4ef58f62e3d8743dd195de777d011df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x608E 9772 bytes

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