Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb0c8fcdd76d672…

MALICIOUS

PDF

35.6 KB Created: 2020-08-29 07:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 952b07cb5edbae7d5c18ccc0e760ab72 SHA-1: 3db88b5d0c863108c714c9c5f323704c5416d4d1 SHA-256: 5cb0c8fcdd76d672f6a55ef19d8388b855986e9081e092719c486c3e0e8332ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.com. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external links, many of which are to Shopify-hosted PDFs. The document body, though heavily obfuscated, contains the primary malicious URL and several benign-looking Shopify URLs, suggesting a lure to disguise malicious activity. The ML classifier also 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.com/wix?keyword=civics+and+economics+textbook+online
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0655/7345/files/kippenzwam_wilde_rijstsoep.pdf
    • https://cdn.shopify.com/s/files/1/0461/3698/3720/files/android_room_query_sum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pelezegagujagemubejapo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/how_to_make_bookmark_in.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/baixar_whatsapp_plus_apk_atualizado_2018.pdf
    • https://cdn.shopify.com/s/files/1/0433/8063/7861/files/streaming_data_understanding_the_real_time_pipeline_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/xabupoxaku.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7284/files/bisusofanalovugosap.pdf
    • https://cdn.shopify.com/s/files/1/0440/9550/4536/files/53464686786.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/apbt_books.pdf
    • https://static.usrfiles.com/ugd/b8c837_27b9f03b846f48aaba7ca3a38fd34522.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1584a88629b41319ec3c2f91c7583ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_c800a2d639294caeb60323729bd83782.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ce3fa0bcc4a4e9384b5cdd3b24dc632.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c31558bff1c4664b5282cef82c857d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f3dcc434ccf4713bb7ef50dd056a26e.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbd587d567d54cbfa75066e5bd6bfa59.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a86.bin
4cc65ea68bde8c046409445f888971e77b63f64ad38afa85bce499447c2e9f66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A86 5224 bytes
font_01_sfnt_off00005c3e.bin
663371018cea30e3d7a3b7d71756a4f65bc40d350783a4da2efd55bf5051d952		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3E 10568 bytes

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