Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a6cfccd0101cdc…

MALICIOUS

PDF

44.2 KB Created: 2020-08-31 02:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d6cde93ce4feb92c20288f5590c7cc0 SHA-1: fa1bc0b5bc50cea245aab88039a99565b9c9a5e5 SHA-256: c4a6cfccd0101cdce346244d591330ac1d9abd7828eae59c3ae9e6205b8cc660
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/wix?keyword=elementary+statistics+picturing+the+world+6th+edition+answers`. This URL is likely used to redirect users to malicious content, disguised as a search result for educational materials. The document body also contains this URL and numerous other links to PDF files hosted on `static.usrfiles.com`, suggesting a link farm or SEO poisoning attempt to drive traffic to the malicious redirector. No scripts were extracted from this sample.

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=elementary+statistics+picturing+the+world+6th+edition+answers
    • https://static.usrfiles.com/ugd/238140_c2990854e2034774909b018f69cc61a7.pdf
    • https://static.usrfiles.com/ugd/e3ff21_38e6e2681b534405a305f34926249917.pdf
    • https://static.usrfiles.com/ugd/de65f7_e5d63308f84747d9ab2b22e8cd329de6.pdf
    • https://static.usrfiles.com/ugd/f09a9d_2c8dd51db531487a8f339f1a180bb305.pdf
    • https://static.usrfiles.com/ugd/4c1554_441321b3e94c40e28001f31fb2610991.pdf
    • https://cdn.shopify.com/s/files/1/0431/5620/9819/files/92671739944.pdf
    • https://static.usrfiles.com/ugd/b8c837_976822f605494c2280f25cbafcfbd61d.pdf
    • https://static.usrfiles.com/ugd/d54300_c81538d2c698424593c771a199d9b984.pdf
    • https://static.usrfiles.com/ugd/eed56f_56e4262694a842359022e23ea546f5d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d59396c198f4cf39d4cf8d6817daf74.pdf
    • https://static.usrfiles.com/ugd/2ac701_3db45a7c1ecb426797c792222353edf4.pdf
    • https://static.usrfiles.com/ugd/934fc3_8b8a238984b740f590b0d5e175541223.pdf
    • https://static.usrfiles.com/ugd/c618e9_99603a0ff04d41b3945484cecdea450e.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://static.usrfiles.com/ugd/c618e9_99603a0ff04d41b3945484cecdea45

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aef.bin
e4b680e210a43fa46ac355c4d6e9a4c0a9f0496704424181a54b2a4dd89e01ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AEF 5792 bytes
font_01_sfnt_off00007e8e.bin
eef84c21f1807e616a5365e76b9e45323a8f8f7618997243a482fbffdbcc3b1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E8E 10784 bytes

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