Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b08b1c648d4f8b…

MALICIOUS

PDF

39.1 KB Created: 2020-09-03 05:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bba5d59cd2954df7f55c463eb341f7a5 SHA-1: 283c7843daddae7f4e5b974cb649270e24133221 SHA-256: f4b08b1c648d4f8bf87c42962060da37fbfcb537704eeddd4009ce3f41b45ac6
150 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, suggesting a phishing or redirection attempt. The document body, though partially corrupted, contains text related to file conversion, which is likely a lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK directly indicates the presence of a malicious URL, and PDF_SEO_LINK_FARM shows a large number of external links, many of which are benign but serve to obscure the malicious one. 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.link/wix?keyword=chuy%25E1%25BB%2583n+%25C4%2591%25E1%25BB%2595i+pdf+d%25E1%25BA%25A1ng+%25E1%25BA%25A3nh+sang+word
    • https://cdn.shopify.com/s/files/1/0454/7192/4390/files/1944919041.pdf
    • https://cdn.shopify.com/s/files/1/0429/9993/9235/files/bescherelle_conjugaison_12020_verbes.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/fotogelizasegaju.pdf
    • https://static.usrfiles.com/ugd/7603ae_b9f67d32a5cf408a8d094f55248222b4.pdf
    • https://static.usrfiles.com/ugd/590778_daf0aac50ff6467a80c188e39e4b90bb.pdf
    • https://cdn.shopify.com/s/files/1/0433/7818/0261/files/chatham_14_theaters.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/90740506569.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6457/files/coliform_test_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0437/7581/9927/files/mw3_hacks_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/74396592463.pdf
    • https://cdn.shopify.com/s/files/1/0431/9153/3725/files/zunejozosekigavov.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/labokobezar.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_off000054c4.bin
eceb7c583e4ea2d23ef242051a020830622fbc1aaaffb74bd692258c94f4bccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54C4 6428 bytes
font_01_sfnt_off000068b3.bin
5663d5b5a8b900e1f5b0e9f14c069672a33ae911efd4a1b45e42a3834fdcbb81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B3 11628 bytes

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