Malicious PDF — malware analysis report

Static analysis result for SHA-256 36644be56ebc56f5…

MALICIOUS

PDF

42.0 KB Created: 2020-09-18 10:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe23a44007a633eb1268744ad211d037 SHA-1: f10264f80a2adabcfad9c0a01f29ddc56db52478 SHA-256: 36644be56ebc56f5c304fd82a9a3054c1fc4f554cce931212a86e49073106a39
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to malicious infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to a "centralized curriculum pdf". The primary malicious IOC is the redirector URL, which likely leads to further malicious content or exploits. The PDF also contains a large number of embedded links, characteristic of a link farm, with the first one being a potential entry point.

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=centralized+curriculum+pdf
    • https://4ed0c8d1-a404-4b10-a17f-21a574086112.filesusr.com/ugd/277b62_b3c9de7aa71e4199a6672b4b16158aa8.pdf?index=true
    • https://e5b03ac7-7981-42a6-b8a4-943631059dc9.filesusr.com/ugd/90423f_584b6ad4ab5941a99bc42b65ff94207a.pdf?index=true
    • https://7dc62e63-c8aa-4232-91f2-21e2a22da9cf.filesusr.com/ugd/9ec29b_ce5a9a24a867442daf46adddab9f4a4e.pdf?index=true
    • https://430de30a-14b6-4ac8-b19e-dc12b10b0fb7.filesusr.com/ugd/76156b_3c7839f347694ce08d7aa29be96e8cd8.pdf?index=true
    • https://92707909-4760-460d-afcd-6eccc33e623e.filesusr.com/ugd/2274a7_d4c7c417aad44d65881de30dda5ea732.pdf?index=true
    • https://709d829e-63e5-4043-8a0a-86a3290bb87f.filesusr.com/ugd/891219_aa9d5e88037445518bcc58c2aecc8360.pdf?index=true
    • https://83ed6749-a759-4ee2-b6cb-0a2604fd67be.filesusr.com/ugd/5befcb_1ee962f50c05402d943fb04e3eb2b817.pdf?index=true
    • https://d5a24c8f-5ea5-437b-a04f-03ef2694a402.filesusr.com/ugd/8c5bc8_4dae4f9ce8684ed4b2c4ce4f3ded3673.pdf?index=true
    • https://38225346-6fa6-4ce9-948c-f2b2b6bc3146.filesusr.com/ugd/36d413_bd60368cc3a0442eb018172ae9d6839a.pdf?index=true
    • https://b92f2d95-f55c-4bff-8f5c-c3677c3d62a1.filesusr.com/ugd/4fb05f_b1a587aa2d7940c5bdfb2be88238af4a.pdf?index=true
    • https://8291bd58-e9d5-4d4d-8a05-9d6611f4943d.filesusr.com/ugd/824332_498619bc8ed240e69d3605c494dcf701.pdf?index=true
    • https://bf407730-e02d-4200-937b-7dce78056833.filesusr.com/ugd/df7b34_73f7fe8411994d048494170076cdcf9a.pdf?index=true
    • https://23a31da1-4ec1-4979-b9d8-e1ee8ce0c3a1.filesusr.com/ugd/49488e_8575ceeff5f2407fb05e7172bc094aba.pdf?index=true
    • https://e7b762f7-dba0-4cef-a782-29546cda80f4.filesusr.com/ugd/086daf_74b6afc4a591423eb4e6d01aca1bdb49.pdf?index=true
    • 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_off00006838.bin
0c31aeb69474eb6d89d120dc49ed47495568561dd50dd935eeb2c8768d478546
pdf-font-stream PDF embedded font (sfnt) at offset 0x6838 5080 bytes
font_01_sfnt_off00007970.bin
7dc9017d1a17f011e6125a5ed72b436f9d825fa93c464f0375c85327b37c84bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7970 9840 bytes