Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd1a8ed7e077b49…

MALICIOUS

PDF

51.8 KB Created: 2020-08-02 16:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7ffbd81fbc67a37137568e3e2824f1e SHA-1: 6f4c529ee0f2b2f2a1cbc5421122038376476982 SHA-256: 8fd1a8ed7e077b4993773aad1fa5ab11a85012f829c8f07d59fe954dd5ab1cbe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link farm pointing to a redirector service. The redirector URL is https://ttraff.ru/pify?keyword=curl+send+json. Another heuristic indicates visible command execution instructions, suggesting the potential for LOLBins to be used. The document body contains obfuscated text but also includes the redirector URL and several Shopify-hosted PDF links, one of which is https://cdn.shopify.com/s/files/1/0436/0214/9540/files/principles_of_econometrics_3rd_edition.pdf. The primary attack pattern appears to be a link farm designed to redirect users to malicious content.

Heuristics 4

  • 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.
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • 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.ru/pify?keyword=curl+send+json
    • http://files.ellisandassoc.com/uploads/1/3/1/4/131454560/xokawa.pdf
    • http://files.alexandradecandia.com/uploads/1/3/2/6/132695629/dofux_sotarum_rojeba.pdf
    • http://ruzaxutoj.tonguetanglingtales.com/uploads/1/3/0/8/130874064/5682345.pdf
    • http://files.adurtreesurgeon.com/uploads/1/3/1/6/131636891/46f5f59eb2cf6f8.pdf
    • http://files.marinerscoveneighborhood.com/uploads/1/3/1/3/131379730/lepajifotag-foburad-tanosarodeso-tivetetikisa.pdf
    • https://cdn.shopify.com/s/files/1/0436/0214/9540/files/principles_of_econometrics_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/dabarepesotilikanowi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdf
    • https://cdn.shopify.com/s/files/1/0433/5940/4197/files/11428389806.pdf
    • https://cdn.shopify.com/s/files/1/0437/0818/6792/files/fejipurixok.pdf
    • https://cdn.shopify.com/s/files/1/0432/1397/9812/files/dinifilonamaweruzefudave.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nulifagavukaxubodipiripu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5838/8374/files/bofijapuvi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/57617255139.pdf
    • https://cdn.shopify.com/s/files/1/0435/0512/3493/files/99603431224.pdf
    • https://cdn.shopify.com/s/files/1/0428/5156/5724/files/9888155010.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0094/files/57755110629.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/zamitomisikawipu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006866.bin
c7f8d7ba7866f22469a4f42aa752fee9e689688586df0b24186a8aacb852870f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6866 4464 bytes
font_01_sfnt_off0000779b.bin
55fbd964f769485563f0068da86d117459e5f1b862d03392fffddd554e9f361a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x779B 11484 bytes
font_02_sfnt_off00009e51.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E51 16312 bytes
font_03_sfnt_off0000b3dc.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DC 4324 bytes

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