Malicious PDF — malware analysis report

Static analysis result for SHA-256 730a1a483954e581…

MALICIOUS

PDF

41.1 KB Created: 2020-08-14 21:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30ee5c0629138f4946893a06457fc63f SHA-1: 26c4aeb014b0f00dfb92d867338684f4081c17b6 SHA-256: 730a1a483954e5814db6624c99cde6d2fa6ec0dad9312303d5703830c7df8f82
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a download button lure and the embedded URLs suggest an attempt to trick the user into downloading a payload or visiting a malicious site. The document body contains obfuscated text and URLs, including the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=url+rewrite+iis+7++x64
    • http://files.navigatingla.com/uploads/1/3/1/4/131438759/dipilutilib.pdf
    • http://files.2020idocs.com/uploads/1/3/1/4/131482886/8a665a60c50913.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6353/3977/files/ramuneforewipexatuxite.pdf
    • https://cdn.shopify.com/s/files/1/0437/4927/7845/files/medofobobuwedojojunumoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6787/files/nupoxuna.pdf
    • https://cdn.shopify.com/s/files/1/0436/1751/7725/files/nabesinimabebisavulasi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4891/8440/files/gepiguwaselogidora.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/cantoral_camino_neocatecumenal.pdf
    • https://cdn.shopify.com/s/files/1/0437/5304/6165/files/learning_pencil_sketch.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/free_app_for_editing_documents.pdf
    • https://cdn.shopify.com/s/files/1/0435/6780/8667/files/76073668680.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2645/files/char_qul_sharif.pdf
    • https://cdn.shopify.com/s/files/1/0433/2499/7800/files/27945571243.pdf
    • https://cdn.shopify.com/s/files/1/0434/1402/8444/files/54021845756.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/petomepobonolavuvuduzuvuj.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006317.bin
ed8bf4704d028bd95a6ca882a32ad559e5e99d55d62b04bec34d0d2cbcbf6f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6317 4944 bytes
font_01_sfnt_off00007420.bin
2bb48f9139fba6d9055b489b5eef54f72e8be3096f74cc2fba83936c9c891f06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7420 10596 bytes

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