Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ca44fd48d42256…

MALICIOUS

PDF

44.6 KB Created: 2020-08-13 06:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34da930b410b5ffe50395a6135c0e2aa SHA-1: df5be55f313427d7ba2de7a1623c652efbd5e5e3 SHA-256: a3ca44fd48d422564643ccd9be1ed6922a3805b7a1efc36ccab25c2af7751443
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to what appears to be a link farm designed for SEO manipulation. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/wb?keyword=casio%20baby%20g%20shock%205001%20manual'. The document body, though heavily obfuscated, contains text related to a 'Casio baby g shock 5001 manual', suggesting a lure to entice users to click the malicious link. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=casio%20baby%20g%20shock%205001%20manual
    • http://files.tru-motiv.com/uploads/1/3/1/1/131164295/mibumilufutivadota.pdf
    • http://files.mimodelinginstruction.org/uploads/1/3/2/6/132695646/476123984.pdf
    • http://files.camileaccessories.shop/uploads/1/3/2/6/132681690/8322404df.pdf
    • http://files.morrowtimes.com/uploads/1/3/1/8/131872198/691ab46971.pdf
    • https://cdn.shopify.com/s/files/1/0435/3294/3519/files/aditya_hrudayam_stotram_in_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0431/6315/6641/files/cinema_hd_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2941/files/52563185918.pdf
    • https://cdn.shopify.com/s/files/1/0432/8967/3888/files/revogemu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8387/3942/files/install_cuda_10._0.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/dejufenerikiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/9885/7891/files/47495525804.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/approach_definition.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/attributes_in_dbms.pdf
    • https://cdn.shopify.com/s/files/1/0438/4315/8166/files/88518905906.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/barepasuwomube.pdf
    • https://cdn.shopify.com/s/files/1/0430/3175/6957/files/7246546038.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/rakujivikox.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_off00006c32.bin
2627ef163e8e58261fde75d0c03e5fccd2c4d82eed89e15141ca4bf760fe7214		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C32 5648 bytes
font_01_sfnt_off00007f5f.bin
86f4161bd0a11e5df65e7e69b06fdc6f7343c692ae899a9f2c3bbc3057529785		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5F 12016 bytes

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