Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8f15278142931f…

MALICIOUS

PDF

41.0 KB Created: 2020-09-01 18:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e462fea15c9f4bdd55792681070e47c SHA-1: 3dfb6d5c5d21b97eb84aefc79975f66d03e7c81d SHA-256: ae8f15278142931f5d3e7b5782994a5f4832fd19d6b8b490350af61138c93a6a
168 Risk Score

Malware Insights

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

This PDF document contains a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=envelope+template+word+online'. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to static.usrfiles.com, suggesting an attempt to manipulate search engine results or distribute content. The presence of a 'Password-protected archive handoff' heuristic indicates that the user might be prompted to enter a password, likely to decrypt a malicious payload after initial gateway scanning. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links.

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=envelope+template+word+online
    • https://static.usrfiles.com/ugd/6116da_7841aa75de5e4b12ae57a2a1984a88bd.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_93094e15762d47c19092bbd01de40b50.pdf
    • https://static.usrfiles.com/ugd/d94ae5_ea5869bea8a64fa9adcd02fcbebcd5c9.pdf
    • https://static.usrfiles.com/ugd/0c41e7_d52b1d1223ee4f0785a1c35717103b49.pdf
    • https://static.usrfiles.com/ugd/c3f88d_4ed06e2693484e28bd19200856983fa9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4596a7deb9a4e2b80d4de45785102e6.pdf
    • https://static.usrfiles.com/ugd/4b7290_0c80a25caf434c0c9fc11b562b857a12.pdf
    • https://static.usrfiles.com/ugd/f1780b_bba2a426c6344084bf3262868359d97b.pdf
    • https://static.usrfiles.com/ugd/3b0c81_62daa4d6be384d41ac36c5bc3d0b5f9a.pdf
    • https://static.usrfiles.com/ugd/1e32c2_30a0ee00e6ad476692f2c8a5dfa7763d.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_6c25e0b1e3454231a54ec1ac463f6513.pdf
    • https://cdn.shopify.com/s/files/1/0447/9077/5965/files/bayes_optimal_classifier.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/rokumigomojani.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/razelanedu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/1321019561.pdf
    • https://cdn.shopify.com/s/files/1/0428/2892/3046/files/91534475664.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062fe.bin
786cad2ea273120ebc364ea75d139c128b3f7f320a3ef24942f05319b7fdb2eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FE 5036 bytes
font_01_sfnt_off0000741c.bin
4591263780ce886ac1ff6d7b3ffd65b570af5fcfd85d05432a1751daf294198c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741C 10296 bytes

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