Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a4f990ca5636d2…

MALICIOUS

PDF

57.9 KB Created: 2020-08-31 14:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c321a8ff2cfc2af1404e6b50b152cf29 SHA-1: 2fbe90f958c91784fb4a691bb581673b5140f67c SHA-256: 47a4f990ca5636d23bf5ece26105d21779b3c6e01996b548cb82c85dee4aa4cf
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised with a search query for "birthday song tamil movie". This suggests a social engineering lure to entice users to click the link. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, indicating a link farm or redirection strategy. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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/wix?keyword=birthday+song++tamil+movie
    • https://static.usrfiles.com/ugd/b77b08_8c28423fb128457092e5481c58a6cd94.pdf
    • https://static.usrfiles.com/ugd/b7ab08_c5d67d84b100484da497012d99a38340.pdf
    • https://static.usrfiles.com/ugd/2e16aa_522659d55dbf4b0986dbdbfbbcceb16e.pdf
    • https://static.usrfiles.com/ugd/b8c837_139045fa44014a24ac06e59f8c364058.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_0097512705974dc686fae1ddfceba794.pdf
    • https://static.usrfiles.com/ugd/5cf23b_446686ad46234d3ea06fff91814521e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9fa12ee0e809401e862ed42c121de7a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_38cd90dd58504d1fadfffde7be757e50.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e245d0cbf3d46e1b6d4f6411a156c38.pdf
    • https://static.usrfiles.com/ugd/6d59ab_c87334721c01497b88bcf1d81b9fe7a3.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xakikalimakimoxe.pdf
    • https://cdn.shopify.com/s/files/1/0462/2758/7223/files/taxavafeto.pdf
    • https://cdn.shopify.com/s/files/1/0437/8751/8104/files/90131424960.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2229/files/23517135296.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0944/files/jozikojirix.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a617.bin
12b9d0863262a95e1ba31d1fe124fd6d6aba0ad64653555472017eac4400269d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA617 5452 bytes
font_01_sfnt_off0000b885.bin
418c36f533e5797381787b71bb3ebf2c08fbda7fbddb8910db364294fd5d87f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB885 13508 bytes

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