Malicious PDF — malware analysis report

Static analysis result for SHA-256 07211ac74a3e27bb…

MALICIOUS

PDF

34.5 KB Created: 2020-09-21 00:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d5dae7d16f0d403a3c9547da9e31216 SHA-1: 97010576edce14e136fa74919186bb1c4659dcf2 SHA-256: 07211ac74a3e27bb83b684e47b705d4048a8606eebb5d11cb43c8a8ea8648dcc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm. One of the primary links, 'https://ttraff.club/wix?keyword=lcps+2019+and+2020+school+calendar', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a campaign to drive traffic to malicious infrastructure, likely for phishing or malware distribution.

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.club/wix?keyword=lcps+2019+and+2020+school+calendar
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7409/3217/files/wifopose.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/73186367635.pdf
    • https://cdn.shopify.com/s/files/1/0436/6827/5353/files/chelsea_and_yamir_instagram.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/56964573319.pdf
    • https://69a8d9d9-52ee-45c8-9c40-40d988f9db25.filesusr.com/ugd/b6aaa0_6046f991ef454f588ef15e5114068b72.pdf?index=true
    • https://b550ced2-602d-40aa-904d-09a3b89b2f37.filesusr.com/ugd/9b7d8a_6ca2901d1f1d40b8bfde5ee499296318.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/4156/2522/files/79168879634.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1981/files/66760697433.pdf
    • https://cdn.shopify.com/s/files/1/0429/7539/5993/files/kaplan_cs_book.pdf
    • https://cdn.shopify.com/s/files/1/0484/4712/7720/files/grand_rapids_press_recipe_archives.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/67832981184.pdf
    • https://2697e453-d9be-448a-a96c-85dd2d84b0da.filesusr.com/ugd/0fdb6d_f3f9c3a473644c2fa2831643f120ed4e.pdf?index=true
    • https://5617ee1e-9308-4afe-9de7-c986f86dc8cb.filesusr.com/ugd/dcc11b_70bc83f1326349b9bd04d382dea26b3a.pdf?index=true
    • https://48dd410e-a2fd-459b-a253-e4fa07f7c081.filesusr.com/ugd/3225da_17758ffedfe542fa943718a7757c75b3.pdf?index=true
    • https://7924ed82-8496-4497-b7f9-06b54dff1c8c.filesusr.com/ugd/ce4b7c_ff3daf88a92241afad802c595babd930.pdf?index=true
    • 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_off00004826.bin
83f89a7cc396f6057faeb486c5852638032936c10258411b67fd9b5babc85131		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4826 5584 bytes
font_01_sfnt_off00005b24.bin
bb03db14d342e8aef2d301e6f256cb2ff3a915a03d759f26f6bd2ffa269b1d0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B24 9888 bytes

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