Malicious PDF — malware analysis report

Static analysis result for SHA-256 5908a679fd517a7e…

MALICIOUS

PDF

41.1 KB Created: 2020-08-11 12:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 992fb631a5f39fb393124945a79a74d0 SHA-1: 515984649f9f321242bd4843fc57c7130f1ce8f3 SHA-256: 5908a679fd517a7e337224eb4db926f9e0e9979303a8c8e6fe976335cf83d824
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent. The primary malicious IOC is the redirector URL, which likely leads to a phishing page or malware download. The document body, though heavily obfuscated, contains the target URL, suggesting a lure related to educational materials.

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.com/pify?keyword=math+teacher+s+guide+grade+10+pdf
    • http://files.graphicetch.com/uploads/1/3/1/3/131381675/3094754.pdf
    • http://files.busystatic.com/uploads/1/3/0/7/130739836/tirawolaju.pdf
    • http://files.dmcpraha.com/uploads/1/3/0/7/130775519/fikidomovivo-fanabigixe.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/gugigujojepoxuri.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofifarigomikidapowokov.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/fowisonigidapezudowarogux.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3487/files/27643395185.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/dofevabubiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9146/files/acls_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/9648/7576/files/ntpc_math_syllabus_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/biology_class_11_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/2301/4824/files/mathematical_analysis_s_c_malik.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/63363589399.pdf
    • https://cdn.shopify.com/s/files/1/0437/6661/2130/files/2310722764.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_off0000636f.bin
650b73a0b8223e388ffa7ab72cfd1e1049306140d06858831c308e355ade3f3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636F 5584 bytes
font_01_sfnt_off00007672.bin
42b564b67cfa28fd080682660b55894094991d82ebde6df5cc37a68ef14445f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7672 9708 bytes

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