Malicious PDF — malware analysis report

Static analysis result for SHA-256 d525d75172556e65…

MALICIOUS

PDF

50.8 KB Created: 2020-08-09 07:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f563b7ccc7ed280eb2efa0400a6ed19 SHA-1: 2e41613f0b96249558be79804dd38248e06e13ce SHA-256: d525d75172556e650e7d149ec0e7d26efd00d6323b5752753f16ee6a6c549b70
120 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.cc, disguised as an educational worksheet. This suggests a phishing or social engineering attack aimed at directing users to malicious content. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, likely to improve search engine ranking for malicious content. No scripts were extracted from this sample.

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=algebraic+fractions+equations+worksheet+pdf
    • http://files.kashmirhouseboatsonline.com/uploads/1/3/1/3/131380875/8474381.pdf
    • http://files.suffah.in/uploads/1/3/1/3/131380547/1192257.pdf
    • http://files.goucherstudentartshowcase.com/uploads/1/3/0/7/130775506/tonobikujazina_wurem.pdf
    • https://cdn.shopify.com/s/files/1/0428/5884/0223/files/68563789047.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/norotuvulebokezisukokam.pdf
    • https://cdn.shopify.com/s/files/1/0433/1326/6846/files/33214883911.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/9373770428.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/folukuwevu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8761/7436/files/fakuvuduxudilete.pdf
    • https://cdn.shopify.com/s/files/1/0437/7654/0834/files/vixejafodikazidaziv.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/bootres._dll_corrupt_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/25791381169.pdf
    • https://cdn.shopify.com/s/files/1/0433/7362/5500/files/40653997516.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5080/files/rexowonodasubolonajam.pdf
    • https://cdn.shopify.com/s/files/1/0434/9257/3336/files/proceso_de_destilacion_por_arrastre_de_vapor.pdf
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/bezefukitedezusuz.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_off00007f3f.bin
562490dba1295f865d159dacf86e6faba5bb51854a84f47c5f44f82fd8a61554		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3F 5828 bytes
font_01_sfnt_off0000931b.bin
d254ec4b39b96fa5fdd2134ce2cfab5e83538aa04001394302e6224538591695		 pdf-font-stream PDF embedded font (sfnt) at offset 0x931B 14040 bytes

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