Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cc0fd4418fabe4…

MALICIOUS

PDF

43.5 KB Created: 2020-08-21 13:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aebb1914a8c3f66e2e67aaed1d317157 SHA-1: 9d66fe968f1c1ab90e94f70a529fac8d3815b98f SHA-256: c7cc0fd4418fabe4c03b519205814ffd35ad9dd8989452a8a4b3f746e75f512e
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a "wjec candidate declaration form". The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=wjec+candidate+declaration+form
    • http://files.pondwoodwonalancet.com/uploads/1/3/0/8/130874559/1562528.pdf
    • http://files.rmbc.edu/uploads/1/3/1/4/131454012/6980378.pdf
    • http://rofejowe.kramersearch.com/uploads/1/3/1/6/131607919/4382180.pdf
    • http://togal.waynecdmi.org/uploads/1/3/2/6/132695457/6204349.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/rujutav.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/light_reflection_and_refraction_class_10_numericals_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/parti_politik_di_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0448/9861/5451/files/dalobawisenafupelojafu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/57650291473.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5229/files/tesojusaj.pdf
    • https://cdn.shopify.com/s/files/1/0439/2534/0328/files/st_caste_list_in_maharashtra.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/86753896266.pdf
    • https://cdn.shopify.com/s/files/1/0429/8457/1031/files/wemesirafetupani.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_off0000614f.bin
b5c161754a2c53ced27e7c908e4e66d2970997d62c25eff70f0d0294a7f74026		 pdf-font-stream PDF embedded font (sfnt) at offset 0x614F 5080 bytes
font_01_sfnt_off00007291.bin
88d697c7cad6d02131c2c74912a77f6e857f77edbeffc6910d1bcb93a7cbf6b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7291 14944 bytes

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