Malicious PDF — malware analysis report

Static analysis result for SHA-256 07221c65a99f9fd8…

MALICIOUS

PDF

81.8 KB Created: 2020-09-21 00:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96049dca358aa7f62aa5829181de5d16 SHA-1: e3482f1361c55631c228376094363680a9d3a528 SHA-256: 07221c65a99f9fd842c8b5370d815f2cbde438bfdc01e6dbfdf03e941d78e20f
174 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector. The presence of numerous external PDF links, some benign and some potentially malicious, suggests a link farm or redirection strategy. The heuristic 'SE_CALLBACK_LURE' further indicates a phishing or scam pretext.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wb?keyword=relion%20prime%20owners%20manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/bunijetupesaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5956/9055/files/how_to_play_backyard_baseball_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0436/9989/6475/files/applied_linear_regression_models.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0759/files/rowafibofexavasu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0397/7634/files/irda_exam_date_sheet.pdf
    • https://26e49216-be28-4125-83e8-cf7a8fbf9794.filesusr.com/ugd/10b03a_ad7436be673e41c6856cf3fb5bbb9e8b.pdf?index=true
    • https://5d5ebe6e-7b63-4bd7-828e-8101c8d00d9b.filesusr.com/ugd/c1c462_4b33f179787d43ca881d17aec0370446.pdf?index=true
    • https://67cdfb81-a808-40a0-976a-e8962c747ce6.filesusr.com/ugd/2813e2_370b3589357741eeacd3770da51e6033.pdf?index=true
    • https://e7198bb8-c12b-4a5e-b2ff-0c82d2a7ea73.filesusr.com/ugd/67f5f7_4c9bf419fcf144d1aad9d7d246f27715.pdf?index=true
    • https://9132658a-1497-40dc-b238-21cbfdf4b919.filesusr.com/ugd/3ce946_f7c0f69041cd4511830ce3b4942b1eb4.pdf?index=true
    • https://9953f87d-7c58-4577-b512-a6446404f2e2.filesusr.com/ugd/544c7e_fcc3437e6f9b42889d30effd34a65497.pdf?index=true
    • https://951bb59f-78d6-4484-9556-26fae13441c8.filesusr.com/ugd/e56fe2_4e1285cb7d9d47b5b8c04da90a43a4c9.pdf?index=true
    • https://30252627-7e01-4531-91b7-b2f7baa04503.filesusr.com/ugd/87a178_5e9cb4d5daf94d1eafdaf5387a7e3af5.pdf?index=true
    • 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_off0001028e.bin
294a6e43b448c725a5726a461a7f80671dbf944b0983f8ffa4e1ef62e9ea26d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 5064 bytes
font_01_sfnt_off000113bf.bin
220ffe1e8a542dd8a1eccb3bfc29069f5bff69342b8658aa9a42cd8f58ebcec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113BF 11016 bytes

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