Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7f9789dbe7171a…

MALICIOUS

PDF

41.2 KB Created: 2020-07-15 14:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ab028840b0537ff38a86628db5e3ca4 SHA-1: 7e982f53d73bd707e95aadff39a83c3fe37d3ac9 SHA-256: 5d7f9789dbe7171ae9684b9a65a310eaa4a415b10559c3630df14bee18179d4b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with a critical heuristic firing indicating that many of these links point to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary purpose appears to be distributing traffic to potentially harmful sites through a link farm.

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/wb?keyword=clause%20and%20phrases%20worksheets
    • http://files.glsgroupllc.com/uploads/1/3/0/7/130739922/1925766.pdf
    • http://files.ccbreland.com/uploads/1/3/2/6/132681390/folozukolu.pdf
    • http://files.elginparkathletics.com/uploads/1/3/1/4/131406413/xikudenaw.pdf
    • http://files.tonyottenauthor.com/uploads/1/3/1/4/131453924/847da69e.pdf
    • http://files.atthehelmbluffton.com/uploads/1/3/0/9/130969986/xepanenulotakew-vekijimemun.pdf
    • http://files.authorkimfox.com/uploads/1/3/1/3/131379612/kemunafejebos_furugamoros_vagububike_wivosoruda.pdf
    • http://files.musicartssessions.com/uploads/1/3/1/0/131070895/jivegupobagiwimi.pdf
    • http://files.ded4inclusion.com/uploads/1/3/0/7/130776249/8217263.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://delusuvewep.files.wordpress.com/2020/06/xokumo.pdf
    • https://babamapik.files.wordpress.com/2020/06/61670949359.pdf
    • https://nemogodulivo.files.wordpress.com/2020/06/ronoxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5993/6421/files/94672517365.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fedixudarat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdf
    • https://cdn.shopify.com/s/files/1/0431/3510/7233/files/diwos.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/jabogadikifakusululifizom.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/bazemodapiseviluvufasomu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9946/files/rosatalagugipexogab.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_off00006414.bin
98a054df0e28196fc39351f519f3f075db279a0409ec8f7ffe3dec1089a45b4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6414 5060 bytes
font_01_sfnt_off0000754c.bin
5edc798635a50838d9f64ac3e5aadd337e01c3a5a9adfa711b9ff51adc30f8b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x754C 10008 bytes

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