Malicious PDF — malware analysis report

Static analysis result for SHA-256 51781f065f3a8d59…

MALICIOUS

PDF

40.1 KB Created: 2020-08-31 09:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89f53751e551b10d2dfafa4590299ca4 SHA-1: e610d331714c2772681648fb49e50644c316c2c4 SHA-256: 51781f065f3a8d593ebdc90df9ac4c28a5eade50b36dcc3d13386f556e3d2c76
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files, indicating a link farm. One prominent link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the redirector. This suggests the primary goal is to redirect the user to malicious infrastructure.

Heuristics 3

  • 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.
  • 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.com/wix?keyword=lasker%2527+s+manual+of+chess
    • https://static.usrfiles.com/ugd/e73fea_922b522a6e0a46bc92e97f26e4274aa7.pdf
    • https://static.usrfiles.com/ugd/b8c837_f659c897f05241d9bef5f2e9d0facd81.pdf
    • https://static.usrfiles.com/ugd/b8c837_04441d11a284475b909021614dadf60f.pdf
    • https://static.usrfiles.com/ugd/b8c837_67660d60ef52465fa2f1dc49f206c923.pdf
    • https://static.usrfiles.com/ugd/d43733_ad8a7e0e2e4e480d9b1bc6fd2917f941.pdf
    • https://static.usrfiles.com/ugd/b50c55_378e1555fea44a7bb184e03b2ed85476.pdf
    • https://static.usrfiles.com/ugd/87d215_29b4f8fa1f604d84a096641c2774d054.pdf
    • https://static.usrfiles.com/ugd/09273f_fb85ebcba5d84bd9860b8edd1081c3c0.pdf
    • https://cdn.shopify.com/s/files/1/0434/2025/4375/files/ancient_greece_reading_comprehension_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4661/files/zakarofelijixafigapewosoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6486/files/vafajerenuxexopusin.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/python_trim_string.pdf
    • https://cdn.shopify.com/s/files/1/0431/7554/2950/files/vejivevabadeloreguxetev.pdf
    • https://cdn.shopify.com/s/files/1/0437/7195/3301/files/lukupimilijuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/5960/9753/files/descargar_novelas_romanticas_escocesas.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/5435512172.pdf
    • https://cdn.shopify.com/s/files/1/0433/9662/8641/files/children_s_day_invitation_card_template.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_off00005fa2.bin
d3f51f0fa610dfa699b7f5942dee7ddc422bf06f351eb8055834f21dedaf931a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA2 5160 bytes
font_01_sfnt_off0000710b.bin
cc22ff6f7672f9329721d35067b4dbe5bf641523f7e035a35c21a21efbd9d808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710B 10380 bytes

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