Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7c8d50d48d85a6…

MALICIOUS

PDF

43.8 KB Created: 2020-08-19 17:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cc65d5b8e8a7a819edeeba37a964dd3 SHA-1: 7074891049788b87aaab762831e6809d52478838 SHA-256: 6a7c8d50d48d85a6992f55997618b1dccd6c7d722fbfb2479ced6e4db20aee1f
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files, characteristic of a link farm. One prominent link directs to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The document body, though heavily obfuscated, contains the URL that likely serves as the lure.

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.ru/pify?keyword=beyblade+g+revolution+games+free
    • http://files.jenkmark.com/uploads/1/3/1/8/131856757/e0e10f913b9.pdf
    • http://files.waiheelimu.org/uploads/1/3/0/9/130969934/dedomonapeje.pdf
    • http://files.paqu.org/uploads/1/3/1/8/131871894/vibofukupu_ruzererijolibij.pdf
    • http://gebed.mesastreetmercantile.com/uploads/1/3/1/0/131070590/594ae7a80f9.pdf
    • http://xekip.lsvlmassagetherapy.com/uploads/1/3/1/0/131069759/pijisup_luresosisinusar_fijotup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8373/3921/files/giganifa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0091/2282/files/classroom_rules_for_preschool.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1578/files/gazevuxuxasofu.pdf
    • https://cdn.shopify.com/s/files/1/0438/7930/1288/files/sasisidasodez.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/39123549877.pdf
    • https://cdn.shopify.com/s/files/1/0434/0750/7606/files/68032982557.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6488/files/meseme.pdf
    • https://cdn.shopify.com/s/files/1/0431/2327/7973/files/company_capital_structure.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/business_analyst_resume_filetype.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/dafivoposeluvinobonurasi.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_off00005559.bin
c8ac5d1448e632b1343e3fbafbeee70e5f91b9a77613f75110537b2f0bdb228a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5559 5576 bytes
font_01_sfnt_off00006847.bin
15c7531f060b916500ae16ce1a7221003586b5f01de55f78cc88bb4ea8cfd836		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6847 10216 bytes
font_02_sfnt_off00008b75.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B75 16092 bytes

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