Malicious PDF — malware analysis report

Static analysis result for SHA-256 951fb9bd967f7f7e…

MALICIOUS

PDF

43.8 KB Created: 2020-08-15 03:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acc7f56afb613b1d34d77e2b913681a4 SHA-1: 67628d72f5b5c800567e51c155090bfc6728a488 SHA-256: 951fb9bd967f7f7ecd25d30cc324e402d53e679dbb6e5312e65ca5a0fe409316
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=blood+bowl+2+dark+elf+steam+guide'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are hosted on Shopify but some point to unknown or potentially malicious domains. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same redirector URL, reinforcing the 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/pify?keyword=blood+bowl+2+dark+elf+steam+guide
    • http://nevogemuv.apaky.org/uploads/1/3/1/4/131437502/1970625.pdf
    • http://files.toniosborneyoga.com/uploads/1/3/1/1/131164473/78271.pdf
    • http://radeneke.suyana.net/uploads/1/3/1/4/131452821/1384144.pdf
    • http://files.researchcubaneducation.com/uploads/1/3/2/7/132740414/284736c6.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5060/files/internal_audit_report_sample.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/fesokex.pdf
    • https://cdn.shopify.com/s/files/1/0433/7244/5854/files/zibak.pdf
    • https://cdn.shopify.com/s/files/1/0431/5732/3933/files/xunujofakovilivu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2033/6802/files/9526925679.pdf
    • https://cdn.shopify.com/s/files/1/0431/9477/7760/files/74412178499.pdf
    • https://cdn.shopify.com/s/files/1/0436/1617/4243/files/tulitaxobipuwo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7351/2359/files/25760193003.pdf
    • https://cdn.shopify.com/s/files/1/0428/0408/4899/files/58997876879.pdf
    • https://cdn.shopify.com/s/files/1/0449/8436/9311/files/astm_e84_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8240/7335/files/fakunenugatawujudodujogo.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_off00005fee.bin
3378fb563316aa3a0ff703456f93887e917c5992a5f6d9508932a13bc8f56780		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEE 5704 bytes
font_01_sfnt_off00007362.bin
47f30249540eeda2413fa3c86b2059324f2f01850f715e507d03c4ba93d94200		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7362 15292 bytes

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