Malicious PDF — malware analysis report

Static analysis result for SHA-256 4050c8c5b7bd31dd…

MALICIOUS

PDF

48.6 KB Created: 2020-09-03 13:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cb92178cc0862beb753e15829e77c1a SHA-1: fefea31ebf71f72d5e27190b28aa1c423289ab28 SHA-256: 4050c8c5b7bd31dde5b8a325d304b03ab46385e90af383d3fc6039ab8f02cb36
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.me/wix?keyword=add+and+subtract+fractions+word+problems+worksheet'. This URL is presented within the document body, disguised as a worksheet. 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 malicious URL is the most critical IOC.

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.me/wix?keyword=add+and+subtract+fractions+word+problems+worksheet
    • https://static.usrfiles.com/ugd/b8c837_40eb60b50abe44e692d1f16c1938b99b.pdf
    • https://static.usrfiles.com/ugd/b58d21_408fd3c0a196421aae0be45e7102003b.pdf
    • https://static.usrfiles.com/ugd/1e4819_81feb1900fe042f898d5cb4436bde5dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_910ca1f853d14bbd9914e32619b9fbc3.pdf
    • https://static.usrfiles.com/ugd/44b221_1dfef830a82f47e68fd68cd813753d6d.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/address_in_alabama.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/26320772317.pdf
    • https://static.usrfiles.com/ugd/912de2_dddf5ac349bc47349fbc99e337d73c7c.pdf
    • https://static.usrfiles.com/ugd/11baf9_8259ac9994724efa88e9ea1361642d24.pdf
    • https://static.usrfiles.com/ugd/5dc3ca_4e6b1fff757a43fe8f8aa78ea4f2d417.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cc9a21817e24df2867177d881349732.pdf
    • https://static.usrfiles.com/ugd/10b03a_d8d7ae75d5314af292c73f99bfea1ccd.pdf
    • https://static.usrfiles.com/ugd/b8c837_5862d2c5c5884edd852281edacd75649.pdf
    • https://static.usrfiles.com/ugd/87a178_37c241a84e4643a3a4eb6dd719b7fffb.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4ba4d94663945188c53ab2d047448fd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006424.bin
6fd27d72a7f2dafe1ade67ce0d32309edf03d23bb91c339c7e671d206ebd2f13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6424 5680 bytes
font_01_sfnt_off0000775c.bin
597a3bcb566e541ba797a4841b5d289ee2fa2c965d79130bdfe653384ad5f824		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775C 10556 bytes
font_02_sfnt_off00009ba3.bin
b8f3532aaa1b6b2d7332c34d44591e7c403f7c6032a888860e75b2c35f4dda43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA3 17412 bytes

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