Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a30953c887a799f…

MALICIOUS

PDF

63.2 KB Created: 2020-09-18 19:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69f8897063bc8bb01106a43d93758b2b SHA-1: 79d67683c01e8d89d90f41173a8968cdc41e86bb SHA-256: 6a30953c887a799f2c664f81d531a5f1d1c0b19dcccb6009736985c3e48d97a1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic. The ML classifier strongly indicates maliciousness, and the presence of numerous links suggests an attempt to drive users to external, potentially malicious, sites.

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.link/wix?keyword=chapter+10+apush+key+terms
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://122351d1-bec2-4719-94cf-1b7960be3e02.filesusr.com/ugd/e643da_64c136159c25482694c1cf3bb6ae4ba0.pdf?index=true
    • https://b08ea6d7-35a6-403b-b445-d51834d0bf2b.filesusr.com/ugd/4329d7_b1aaebda4f1f40048ce64987cf10106f.pdf?index=true
    • https://b52485a0-5825-4b9e-abaa-3fcbb0f84cf8.filesusr.com/ugd/3c2e2e_34e1a5661d5e49c4ae003f9f526e054a.pdf?index=true
    • https://aca12aa4-d453-4fbd-953b-4139ef01156c.filesusr.com/ugd/e481ce_0c1262c933b0496eb7f92825f1b23e16.pdf?index=true
    • https://2e0b3dbd-532c-4ca4-bcb2-24837ecc70ef.filesusr.com/ugd/4542d9_a59e0fc1497c4c43be9db0cb66c42a5c.pdf?index=true
    • https://8f13a7e3-e954-487e-a2cd-43f53a1e9fba.filesusr.com/ugd/04c368_ccd3568bb6904a5fb7b4cce9257ac245.pdf?index=true
    • https://eac62c59-ee09-4e2a-b473-e72edf2c4cd8.filesusr.com/ugd/e0d0cf_e8d3a19f6d1247d0abc953aea2f7117f.pdf?index=true
    • https://f2d35cde-0716-48df-9045-ab1f823b32bf.filesusr.com/ugd/fbccce_1d0f4b4326204b398f7bb06751892ad8.pdf?index=true
    • https://591cfd6a-5de0-4954-b4c8-39a4d4e8346d.filesusr.com/ugd/2ca22b_d3f08301b4804f9badc3c320af508570.pdf?index=true
    • https://e5e3e27b-20f9-460a-8eea-9a57f0acfdc0.filesusr.com/ugd/592671_044527428cd04ae3be337fab6a4a081d.pdf?index=true
    • https://cf53a474-a114-4870-893a-407cde96d1c0.filesusr.com/ugd/fb83f1_c3d7cdd9818c4c018b62edcb549562c6.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0436/5670/8254/files/sirivemotubipe.pdf
    • https://cdn.shopify.com/s/files/1/0428/2384/3996/files/56003766917.pdf
    • https://cdn.shopify.com/s/files/1/0431/2252/4326/files/classroom_expectations_template.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_off0000ba72.bin
7265ad0737745715befd513033407aecd6ca0441f6b2f632eb8e1f426aadd020		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA72 5292 bytes
font_01_sfnt_off0000cc48.bin
75e2e8455682a67503253f7725c5b8e30def057f62f4e7396cf5f374d0623fe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC48 10420 bytes

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