Malicious PDF — malware analysis report

Static analysis result for SHA-256 731039754d2934d4…

MALICIOUS

PDF

48.8 KB Created: 2020-08-30 00:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f96056d03c149373fbaefacb400cf56 SHA-1: 8028c4b77d3813231960acffd4ecc79023220cb4 SHA-256: 731039754d2934d4b0ac020413ad756088ba477a3037131f4120ec76bd040aae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm or SEO poisoning attempt. One of the primary links directs to a known malicious redirector, suggesting a phishing or malware distribution scheme. The ML classifier also strongly flagged this PDF as malicious.

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=top+10+gangster+movies
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/9b33c5_f44bca91ac8d4d79bc603d5c35ec4f02.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd9d5ca1546f425fb01233295b19e73b.pdf
    • https://static.usrfiles.com/ugd/b8c837_88b9ef4220b64299b85ebb8981df6e3a.pdf
    • https://static.usrfiles.com/ugd/32acb1_567ed378fb3e4ab2ab68741ff566cb1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d2309370a324b2c9b9d451de9dedad4.pdf
    • https://cdn.shopify.com/s/files/1/0428/3550/9415/files/wupunuxujibofa.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/14042088943.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3397/files/employee_attendance_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0457/7067/0236/files/guns_germs_and_steel_answers_episode_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/7083/2291/files/oops_i_fell_in_love_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/1941/0328/files/94503929959.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/golotixoder.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_601cf47da97746f494492a9be7e205c9.pdf
    • https://static.usrfiles.com/ugd/3b7182_794bccebfbbb402da9ec93c383595285.pdf
    • https://static.usrfiles.com/ugd/b8c837_7164653375814b81ac3ed7067aff12c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_d850670ac11a4000abbfad43d7352e1b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007389.bin
544d661f0e32d6ebeefbb0c408bb6d0efe8d032b1325f1d34c2fd1a69847186b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7389 5096 bytes
font_01_sfnt_off000084ce.bin
08669603be4e887df340b74bb53bf19be5b053ccf5e00bfaa36a1bd86f19945a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84CE 10444 bytes
font_02_sfnt_off0000a87f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA87F 4324 bytes

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