Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8423bcd4d8697d…

MALICIOUS

PDF

44.2 KB Created: 2020-09-01 01:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4640c34dc548a2f4fb17dc09da4d41db SHA-1: ed64ab87560d5a1ec19abac42daf7e64c1ab7e0c SHA-256: fb8423bcd4d8697d2ee5c8ce13628ea8aacb3f2994484ee4f4535488416bd715
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 'English language paper 1 example answers'. This suggests a social engineering lure to direct users to malicious content. The file also contains a large number of embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm. The primary attack vector appears to be a deceptive document leading to a malicious URL.

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=english+language+paper+1+example+answers
    • https://static.usrfiles.com/ugd/e2c250_101279f11a0d43b3b957a0a79a8813dc.pdf
    • https://static.usrfiles.com/ugd/4b7290_7f370a1934d246a397eb5343d4c2e472.pdf
    • https://static.usrfiles.com/ugd/1a89c8_f0ab67eab97b49bf91d377f39cad7ed6.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d561bd7e3df411cb018252ae87adcdf.pdf
    • https://static.usrfiles.com/ugd/19103d_7ed8e5a3ec2f488282188c5ad69212ec.pdf
    • https://static.usrfiles.com/ugd/b52961_e7acf24035a449858155ea809c42d83e.pdf
    • https://static.usrfiles.com/ugd/89c6ad_624174d5159f4fba804abf3844a0511c.pdf
    • https://static.usrfiles.com/ugd/9c0842_8f41267bf351484ea5861591c42dc936.pdf
    • https://static.usrfiles.com/ugd/b8c837_477c75490c834932864782714d755fdd.pdf
    • https://static.usrfiles.com/ugd/b6edda_c05fc0aa4f8541b385bae194bfbf8c7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_fae17ae0c622442c8a7a99995f1026ea.pdf
    • https://static.usrfiles.com/ugd/7198c1_1dd867ff13c84a33a19c8ca531353526.pdf
    • https://static.usrfiles.com/ugd/e8506d_f046939456a84feab76696d049a1be09.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2a807880bc94fa796a6c93447feb93f.pdf
    • https://filestore.aqa.org.uk/sample-papers-and-mark-s
    • 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_off00006efd.bin
ce35f61bc4bfb15b00febfaaf8048fa26b65b0f8db1cf6ea0d13553c3220a2d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFD 5400 bytes
font_01_sfnt_off00008154.bin
40362bf86db6f14c496221f953a70eed7f0ed337a0dea847cabb5d18b72034f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8154 10272 bytes

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