Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5b19c840692a9f…

MALICIOUS

PDF

59.4 KB Created: 2020-08-26 12:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5842cbeb2d762da3dd1746981611141b SHA-1: 76b6695958f43110a1d27329bdee5c68b1e3ad46 SHA-256: 7c5b19c840692a9f539809f12502d5ff6f703169cb921643aa7834dac46d3d8f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/pify?keyword=clubbed+to+death+piano+sheet+music. The document body, though heavily obfuscated, appears to contain this URL and other Shopify links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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.cc/pify?keyword=clubbed+to+death+piano+sheet+music
    • http://jakuv.mjglobalcommunications.com/uploads/1/3/1/8/131871825/tosujulidixe_xulokegavesuduf.pdf
    • http://files.cmc-info.net/uploads/1/3/2/6/132696112/siziwoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.fontrix.comhttp://www.nhncorp.com
    • https://cdn.shopify.com/s/files/1/0436/4949/9289/files/xezakuzugewagokemow.pdf
    • https://cdn.shopify.com/s/files/1/0432/9907/8299/files/ganofubezaxofewukasa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3686/8762/files/dr_scholl27s_thermal_therapy_paraffin_bath_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0438/4758/1856/files/91155679417.pdf
    • https://cdn.shopify.com/s/files/1/0430/9277/0977/files/3_branches_of_government_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4949/2384/files/kudazibifiririduxu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6477/files/primaxin_davis.pdf
    • https://cdn.shopify.com/s/files/1/0429/2440/8991/files/66658451644.pdf
    • https://cdn.shopify.com/s/files/1/0434/0567/2597/files/logic_gates_examples_with_truth_table.pdf
    • https://cdn.shopify.com/s/files/1/0435/2222/8379/files/xatatag.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7632/files/computer_network_diagram.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f82.bin
7039e1a9373c205a8c99a6c140c131b90706192011b78c7475c551957c8f9b9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F82 5264 bytes
font_01_sfnt_off0000a125.bin
bd304ada27d124c9ce847f69f6672d642fd8fa1ddf12b93d098a0430df8a4c86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA125 3104 bytes
font_02_sfnt_off0000ae44.bin
b64e532ad607fb47698e12253532842e74fd80645b3b102bcbda1ee3fe186b20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE44 10320 bytes
font_03_sfnt_off0000cf70.bin
74d7e649e981b2b6032354eea9045918359efb7bde77488f94737081bcd24260		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF70 4268 bytes

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