Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ada02e9b0f8126…

MALICIOUS

PDF

41.0 KB Created: 2020-08-29 16:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9eaf7e8d339cc9123b72a5b92c4800e7 SHA-1: 828a945f29f48bb0ca977d9ddeafde0f83f24909 SHA-256: e5ada02e9b0f81261b221df6061c6006a4f25fd0bd43d3c091fd2ef063ad0034
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a book chapter, aiming to lure users to a malicious site. The PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics confirm the malicious intent and the use of link farms. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious verdict. The primary IOC is the redirector URL, which is likely used for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.ru/wix?keyword=understanding+human+communication+13th+edition+chapter+7
    • https://cdn.shopify.com/s/files/1/0435/6567/8755/files/nimop.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9878/files/gozem.pdf
    • https://cdn.shopify.com/s/files/1/0437/1405/2247/files/lowes_foley_al.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/17212442759.pdf
    • https://cdn.shopify.com/s/files/1/0447/5843/3943/files/farmacos_antagonistas_h2.pdf
    • https://static.usrfiles.com/ugd/b8c837_542a3a5babbd4b889e26299174a4c0fc.pdf
    • https://static.usrfiles.com/ugd/34ec99_a9381100f9414327a4850eb8867fb7bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_87cbba97ed3043f890761bdf6991f9dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c7fedc56ae14cd1a0b5a23f58cdc1f3.pdf
    • https://cdn.shopify.com/s/files/1/0435/2894/5819/files/unisa_online_application_form_2019.pdf
    • https://cdn.shopify.com/s/files/1/0438/3234/4736/files/cayuga_lake_wine_trail_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/bukezebuvolo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9319/files/android_authentication_is_required_play_store.pdf
    • https://cdn.shopify.com/s/files/1/0433/2175/3758/files/bodybuilding_gym_program.pdf
    • https://cdn.shopify.com/s/files/1/0438/9804/4568/files/steam_games_on_another_computer.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63537272249.pdf
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/tasepi.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/
    • https://cdn.shopify.com/s/files/1/0434/278

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006278.bin
5e3460dc5dbd241f19867b2d0d3f9339439815006da845bbc995034cdec373da
pdf-font-stream PDF embedded font (sfnt) at offset 0x6278 5744 bytes
font_01_sfnt_off000075dd.bin
3a6c25314735f714c651f755064f813e6bafea513874ef4c7ccec2bd5b72113c
pdf-font-stream PDF embedded font (sfnt) at offset 0x75DD 9500 bytes