Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef382650f6febb4…

MALICIOUS

PDF

52.6 KB Created: 2020-08-11 18:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a369095b66ad784227771f9a881d37dd SHA-1: 4df4bab39772a9aa0b6b73117225ac6835bf4b49 SHA-256: cef382650f6febb47310f412b65338bb1b0378dcf0f3e8e594c4426f1229955c
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for educational material. The primary malicious link is https://ttraff.cc/wb?keyword=soalan%20matematik%20tahun%205%20kertas%202%20pdf, which is likely used to redirect users to a malicious site.

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.cc/wb?keyword=soalan%20matematik%20tahun%205%20kertas%202%20pdf
    • http://files.anthonybarnesboxing.com/uploads/1/3/1/6/131637254/2133030.pdf
    • http://files.pathlightwisdom.com/uploads/1/3/1/3/131381612/bufodezexuf.pdf
    • http://files.barbarabairddesign.com/uploads/1/3/1/6/131606198/dcbc55ef09a8da7.pdf
    • http://files.cmc-info.net/uploads/1/3/1/8/131871651/soxomi-jifad-sabote-nirewemiketamo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89120948070.pdf
    • https://cdn.shopify.com/s/files/1/0439/1721/3864/files/realismo_filosofia.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8806/8254/files/jerekazixerava.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/xekulekuviguto.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/hamstring_strain_rehab_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0440/6778/2821/files/96062284038.pdf
    • https://cdn.shopify.com/s/files/1/0430/2009/1555/files/adobe_acrobat_x_pro_reduce_size.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10588857949.pdf
    • https://cdn.shopify.com/s/files/1/0438/4253/5574/files/dovemovazuvikexifezi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5814/files/14342876699.pdf
    • https://cdn.shopify.com/s/files/1/0454/7185/8838/files/3130598377.pdf
    • https://cdn.shopify.com/s/files/1/0431/7842/6534/files/operating_systems_concepts_9th_edition_solutions.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/
    • https://cdn.shopify.com/s/f

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d4c.bin
074876dfcfba2685fb6f9d43f8890ee7c4612f45786ee24176dd36cd9125fad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4C 3264 bytes
font_01_sfnt_off000078fb.bin
43c639ee738013a92181053d44654b2f2cbd68136083bc3cbe019ec349031ea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78FB 5704 bytes
font_02_sfnt_off00008c35.bin
445e33c039b651ca4a1844ee6aab5181b7ab796e471196fb8dea85de847fb07f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C35 10436 bytes
font_03_sfnt_off0000b001.bin
2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB001 16092 bytes

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