Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ef5f11228c4805…

MALICIOUS

PDF

36.6 KB Created: 2020-08-22 19:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70c78b8d18ae50dfd7fe0eff2d23ed89 SHA-1: a02f56de9368512a7f04609196d2c6ef41f28a97 SHA-256: 45ef5f11228c4805a14245b3d1aeb262648ac7a324fe13e17c27e57776545d62
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains multiple embedded links, with one heuristic identifying it as a malicious redirector. The primary malicious URL, 'https://ttraff.cc/pify?keyword=biochemistry+by+h+stephen+stoker+pdf', is designed to redirect users to potentially harmful content. The document body itself is heavily obfuscated, but the presence of numerous links and the critical heuristic firings strongly suggest a phishing or redirection attack. No scripts were extracted, limiting the analysis of further stages.

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.cc/pify?keyword=biochemistry+by+h+stephen+stoker+pdf
    • http://files.antiboredomstudio.com/uploads/1/3/1/4/131406114/remamozebim.pdf
    • http://files.marquetteclimberscoop.org/uploads/1/3/2/8/132814942/9d8043b33.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/critical_theory_international_relations.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5868/files/how_do_i_get_terminal_in_windows.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vasopamomakazemujavinis.pdf
    • https://cdn.shopify.com/s/files/1/0439/9392/3742/files/bmw_x1_2013_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0445/7899/6383/files/foguruvafalu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0807/files/gaxeruraxazosasegawa.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1728/files/76810159410.pdf
    • https://cdn.shopify.com/s/files/1/0430/7995/8679/files/nisatopididowakelu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0241/3735/files/guozhong_cao_nanostructures_and_nanomaterials.pdf
    • https://cdn.shopify.com/s/files/1/0434/8667/5108/files/calendario_mundial_rusia_2020_horario_chile.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_off000051b2.bin
5c826f42d45a5d0bfd2aeb1e9001653f795166149ebf045a9cfdc75b72c5576a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51B2 5508 bytes
font_01_sfnt_off00006446.bin
e7422b94cb19f5eab56912b84ec9fa0038fecbad2a3a27ebe218d9eab45265ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6446 9820 bytes

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