Malicious PDF — malware analysis report

Static analysis result for SHA-256 b785cfe8fa3ec89e…

MALICIOUS

PDF

63.6 KB Created: 2020-08-04 21:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec9546d719bd2da14e88d49d0170772f SHA-1: 2cf4be21a13bad9f0f1821a3d5a9aa15b3092070 SHA-256: b785cfe8fa3ec89e3ec51d9aad9d519d1066d3a90aec8190dd5aef100a419e45
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and other links that appear to be part of a link farm designed to manipulate search engine results. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click a link that ultimately leads to malicious content.

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=cambridge+essential+english+dictionary+pdf+free+download
    • http://files.uslasoccer.org/uploads/1/3/0/9/130970008/919439.pdf
    • http://xomotusim.whiteblossomsoaps.com/uploads/1/3/1/3/131380729/086f6c.pdf
    • http://files.arizonaclay.net/uploads/1/3/1/4/131408581/7581708.pdf
    • http://files.acousticdesignstudios.com/uploads/1/3/1/3/131380741/jituxemeb_javezu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9998/7873/files/dejenoxuwamajomalazele.pdf
    • https://cdn.shopify.com/s/files/1/0431/6843/2288/files/soruvawonuvadiguno.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdf
    • https://cdn.shopify.com/s/files/1/0436/2502/1603/files/homelite_weed_wacker.pdf
    • https://cdn.shopify.com/s/files/1/0441/4462/3768/files/veduvaxafupemufidu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2622/files/63739361852.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/takimuwa.pdf
    • https://cdn.shopify.com/s/files/1/0437/3394/2423/files/tirivug.pdf
    • https://cdn.shopify.com/s/files/1/0434/7455/0949/files/44526565966.pdf
    • https://cdn.shopify.com/s/files/1/0439/2094/9403/files/anemia_por_deficiencia_de_vitamina_b12.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/pelipupofu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1703/files/26729635446.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e80.bin
bbcca513c509fd6edda9460e74c2e6fbec864d4bec4ff810d85ad5a2ee12470a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E80 15536 bytes
font_01_sfnt_off0000811d.bin
2f5b0d4dd89c75c83db3e12ad33baca1f6aa24e1f1fba48edf56901e714105bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x811D 5808 bytes
font_02_sfnt_off000094bc.bin
b7aa4c49cf54cc7cec4c6dad4bd233e08d98f017e6a7613ce92b5e8388f5987a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94BC 9080 bytes
font_03_sfnt_off0000ae5b.bin
45acb18e875b588010c8b377acbb023ed9e5933f2223784a1b9f135a0d93d096		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5B 10212 bytes
font_04_sfnt_off0000d0d9.bin
821024dcae0bd0005d85a3909e99575951459e0c4eb03fe35f66f6ea6f63827a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D9 19264 bytes

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