Malicious PDF — malware analysis report

Static analysis result for SHA-256 a611d25d63710d90…

MALICIOUS

PDF

36.9 KB Created: 2020-08-30 20:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfb07d058bd401a681152689efe995d8 SHA-1: 875e60f392d84e72a179b8964a6431faa5072096 SHA-256: a611d25d63710d901ab75f9af14dbc9590daff577a55c5bde7bdfdd8d2705136
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=sherwood+fundamentals+of+human+physi'. This indicates the document's primary purpose is to lure the user to a malicious site. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links, many pointing to Shopify domains, likely for SEO manipulation or to obscure the malicious redirector. No scripts were extracted, but the presence of the malicious URL is sufficient evidence of malicious intent.

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=sherwood+fundamentals+of+human+physi
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/arrl_handbook_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/zufiluduka.pdf
    • https://cdn.shopify.com/s/files/1/0447/9618/2679/files/tukujosowizixinosoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5956/8027/files/veridevogebibele.pdf
    • https://cdn.shopify.com/s/files/1/0436/6853/7497/files/best_architecture_student_portfolio.pdf
    • https://cdn.shopify.com/s/files/1/0431/3684/3933/files/62367468364.pdf
    • https://cdn.shopify.com/s/files/1/0434/4312/6438/files/the_apostolic_ministry_rick_joyner_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/9067/1771/files/chava_kadambari_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5738/8440/files/50738717273.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6150/files/pygame_draw_circle.pdf
    • https://cdn.shopify.com/s/files/1/0435/3871/0696/files/23309171525.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/rosakigaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/0235/4070/files/truth_table_solver.pdf
    • https://static.usrfiles.com/ugd/f63f29_b24454f6bd664cf5b9ece4a76ce9543d.pdf
    • https://static.usrfiles.com/ugd/57c819_0d7c3e487fc442b7a617032e8944f23a.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_off000051d3.bin
9d59dbd8449f442209452140d29e6ac0a1c19607d8edb1d98c3dcfe988f698dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51D3 5576 bytes
font_01_sfnt_off000064ab.bin
a0bf104de55414e5ab77b33d031651b241759bd995b8b67fe920d75f3a1307b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64AB 9936 bytes

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