Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0f7a26edd43488…

MALICIOUS

PDF

40.9 KB Created: 2020-08-15 02:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1677a8ad9c0846bda55daeacb1f30f4a SHA-1: 5cf639a57d71662c79ff56e4b974be8aff329874 SHA-256: cb0f7a26edd434881980bcad6739b2525bb15a29e0fddac51f5e5e15938f946e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=harris+bitcoin+miner+software+free'. The document body and embedded link information further confirm the presence of this malicious URL, which is presented as a lure for 'bitcoin miner software'. The PDF also contains a link farm, with the first URL pointing to a Shopify domain, likely used to obscure the malicious redirector. The ML classifier 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.cc/pify?keyword=harris+bitcoin+miner+software+free
    • http://files.max-besbris.com/uploads/1/3/0/7/130738696/vewavevebapixufu.pdf
    • http://files.babyjam.net/uploads/1/3/1/4/131453406/1e707da6105e3eb.pdf
    • http://xesomujev.dawncculbertson.com/uploads/1/3/1/4/131408899/mevinaxapunola.pdf
    • https://cdn.shopify.com/s/files/1/0434/5741/3270/files/certificado_digital_serasa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/computer_all_parts_full_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/7518/9401/files/civic_education_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/digukepiduludejor.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5271/files/fagijegawafikelimobiv.pdf
    • https://cdn.shopify.com/s/files/1/0443/5791/0684/files/angle_between_two_points.pdf
    • https://cdn.shopify.com/s/files/1/0430/8667/6117/files/26045243016.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/approaches_to_performance_management.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/jemomasebukokomujorot.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/tidatebotonexitawo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/zastone_d9000_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/9603/9839/files/sunakuwujikugiv.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061c2.bin
780c5e96fd8f9f1b6ea3e3fce30e37bb1c92e421a79fb1b28ca8e2f686ed8309		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C2 5188 bytes
font_01_sfnt_off00007359.bin
752c7f071bd602de9e2250ab4de50627400f76ea6cb8b51717f78fa446f88424		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7359 10392 bytes

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