Malicious PDF — malware analysis report

Static analysis result for SHA-256 611e1732b21fbb00…

MALICIOUS

PDF

40.7 KB Created: 2020-08-30 14:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11f493846b47c843c78d102d802bf53b SHA-1: 89ab0fc39bba4ebe857bbbdb1a9e094c7edbeead SHA-256: 611e1732b21fbb00f0d932f4b87146549c8b080a2c09cd3194f153c961bc6ee5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector, https://ttraff.cc/wix?keyword=mamecan+diyarbak%25C4%25B1r+%25C5%259Fiiri+s%25C3%25B6zleri+indir, which is the primary indicator of malicious intent. The document body text is heavily garbled, but the presence of the redirector URL and the link farm heuristic strongly indicate a malicious campaign.

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/wix?keyword=mamecan+diyarbak%25C4%25B1r+%25C5%259Fiiri+s%25C3%25B6zleri+indir
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75555741983.pdf
    • https://cdn.shopify.com/s/files/1/0431/0787/7017/files/strona_bierna_angielski_wiczenia_past_simple_present_simple.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/zatokugaxezowaveruv.pdf
    • https://cdn.shopify.com/s/files/1/0440/6837/2632/files/92439041379.pdf
    • https://cdn.shopify.com/s/files/1/0431/6128/8868/files/pandoc_markdown_to_code_highlighting.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5b202edd1044a25b199b1d41445b8c9.pdf
    • https://static.usrfiles.com/ugd/590778_b6bde53790944619b722d13c3519323a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6454569ec054182aca7b573c3613ff6.pdf
    • https://static.usrfiles.com/ugd/b8c837_a307bbaee50b4c20bc0aacb279b4e8b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fcc576ca8564adf9185efd0e838529a.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/65536840915.pdf
    • https://cdn.shopify.com/s/files/1/0431/6663/0037/files/nivuzirebivewebujo.pdf
    • https://cdn.shopify.com/s/files/1/0440/5926/3141/files/68857648959.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5559/files/bsc_nursing_exam_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0462/3823/6821/files/nbos_character_sheet_designer_2._0.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046f7.bin
5b61dd0a78ce5b3c2b1e750bfcb83c4fb9c465446112c3b041131665b82ac83a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46F7 5864 bytes
font_01_sfnt_off00005a28.bin
c77eae5bbcf8cc7372c290f4ada103ba2ca3de88d283089f709c32c9ef693201		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A28 11372 bytes
font_02_sfnt_off00007e18.bin
f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E18 16144 bytes

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