Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5728c4e04868acd…

MALICIOUS

PDF

41.4 KB Created: 2020-09-17 23:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0055e0cabfffbbdb5794a84baf3361d SHA-1: 53347d8a37fdc2fe322097b20f6d53b9b61af009 SHA-256: c5728c4e04868acd4d08a5a7a57f7b25e54b74e6062e546bcf46cdf255826018
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a direct link to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body, though partially corrupted, contains the phrase 'Supply determinants definition' and the malicious URL, suggesting a lure. The presence of numerous external PDF links further supports the 'link farm' heuristic, which is often used to obscure malicious destinations or for SEO manipulation to improve search engine ranking of malicious content.

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=supply+determinants+definition
    • http://files.jerryjonesguitars.com/uploads/1/3/2/6/132681436/fapixumiwezewip_zuvetuwigapikim.pdf
    • http://files.americancockapoo.com/uploads/1/3/0/7/130776509/9104199.pdf
    • http://divusadok.williamreubanksinc.com/uploads/1/3/2/6/132696398/gazumebodufupe-zapaluro-kipivop.pdf
    • https://c6091fb0-81ca-4279-aed0-0b0f8e3ac93e.filesusr.com/ugd/3be48b_87363d1a7e2a43149a7ad1891f8a74cc.pdf?index=true
    • https://971672e9-6c28-4294-ab29-0d94549d763c.filesusr.com/ugd/b5aed9_210f2c6bdc7f42ec94a20749da851c3f.pdf?index=true
    • https://04ee83e4-56a6-4741-8bcb-92f54375a59f.filesusr.com/ugd/8a5fcf_1cf96c1de8754576ba68d5677c3ef33a.pdf?index=true
    • https://a092c391-d1e4-4156-8268-71ebfc1fe6a0.filesusr.com/ugd/a2ebd8_58bf8026a15a4fdcaa790cbfcf65f3d0.pdf?index=true
    • https://14b3ea5f-67a4-4c57-89cf-e2ab0e924e1c.filesusr.com/ugd/4aae87_69296a3024f94c0eac1d5921c55e5189.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0435/3739/9960/files/how_to_make_file_look_like_a_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/6110/7096/files/coping_skills_worksheets_for_mental_health.pdf
    • https://cdn.shopify.com/s/files/1/0432/8652/8155/files/tinomideguzibigifi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6501/4432/files/59409173332.pdf
    • https://cdn.shopify.com/s/files/1/0436/4694/3392/files/tomarurofewufelen.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063b1.bin
10854b64a400a8bdf040debae1cfdcb04c462c8d4883edc2d88783a01e8e01d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B1 5392 bytes
font_01_sfnt_off000075f8.bin
edcf03bd277a68723d55913e2510bf0cf09d1c2270a33b7cb1a45436d155b478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F8 10404 bytes

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