Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8710f19f7cfa05…

MALICIOUS

PDF

52.0 KB Created: 2020-08-31 03:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d362e5fedd6fa76fa669565957af70f9 SHA-1: f34c85472f6f3484051be1505ec2371258bee124 SHA-256: 3b8710f19f7cfa052a597c668c944c2163ad8183fa066837d724445e052f65ed
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=a+taste+of+blackberries'. The document body also contains this URL alongside numerous other links to PDF files hosted on Shopify, suggesting a link farm or content-luring strategy. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.cc/wix?keyword=a+taste+of+blackberries
    • https://cdn.shopify.com/s/files/1/0434/1678/0956/files/encyclopedia_of_life_support_systems.pdf
    • https://cdn.shopify.com/s/files/1/0441/0382/7608/files/caxton_associates_lp_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0460/6518/9019/files/algebra_2_logarithmic_equations_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5699/6245/files/mitsubishi_forklift_fd30nt_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/2778/3080/files/xawadadaxidurovaweleg.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/74561552987.pdf
    • https://cdn.shopify.com/s/files/1/0437/1765/6728/files/articulate_storyline_template_ideas.pdf
    • https://cdn.shopify.com/s/files/1/0435/1878/7743/files/facebook_header_template_photoshop.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c6230a38605477197fdd2c6bfb057e7.pdf
    • https://static.usrfiles.com/ugd/04e6f9_be0657e7b42544d2831a7267775f3b81.pdf
    • https://static.usrfiles.com/ugd/76de1a_40c17508efc74c9f8999eb85532c00ca.pdf
    • https://static.usrfiles.com/ugd/10a4aa_da504d84180a4944b0fcbe571ef473ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_be0534bbc0234e57ba9464a9c57a1341.pdf
    • https://static.usrfiles.com/ugd/b8c837_daf4ec05f5bf402faf6d38e30f2777ea.pdf
    • https://static.usrfiles.com/ugd/b3bc21_387480a197154edab77fc66810c9963e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081ff.bin
5a51912bed518aac9ba2c19b14c012c0eb9751d223ad98114616b43090b7c99a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81FF 4748 bytes
font_01_sfnt_off00009232.bin
eb3af33d6a00e54e47bd26766e393a85117e8bbd50b029c22dabf35951538fad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9232 10056 bytes
font_02_sfnt_off0000b4a4.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A4 4324 bytes

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