Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc49ac53f5db3af…

MALICIOUS

PDF

44.7 KB Created: 2020-09-07 23:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 475345f6a69734d477b934cbb6eaa313 SHA-1: c0b68252abcb23275b44d5453b6be8d9ca914236 SHA-256: cdc49ac53f5db3af750e46ee8f76f54a8c4cf9c5d194c750768f534bb0eb61e4
128 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.club/wix?keyword=university+of+southern+california+transfer+credit+guide'. The document body, though heavily obfuscated, contains text related to university transfer credits and a call-to-action phrase, suggesting a social engineering lure. The PDF also contains a link farm heuristic, indicating it's part of a larger SEO-based distribution network. The primary malicious IOC is the redirector URL.

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.
  • 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.club/wix?keyword=university+of+southern+california+transfer+credit+guide
    • https://static.usrfiles.com/ugd/6df952_b36df982607a4398bde9916d81925cd3.pdf
    • https://static.usrfiles.com/ugd/99a8f2_8b0eb511c0e44981bde6175bb63f937c.pdf
    • https://static.usrfiles.com/ugd/286fb8_603695b61349478b8429dc94fdb55cfd.pdf
    • https://static.usrfiles.com/ugd/e9cba9_103173beafca4c388696b27aaaaee7dd.pdf
    • https://static.usrfiles.com/ugd/ddb60a_55e3aa4e600544ee83b8fc450c89d08f.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_821eff97c6b7441fab25059971595052.pdf
    • https://static.usrfiles.com/ugd/55cc32_b4394bdaadde4178af0f7d76a7146fe0.pdf
    • https://static.usrfiles.com/ugd/b8c837_2834bcfd68bd46e392f192ff386ad85c.pdf
    • https://static.usrfiles.com/ugd/d9e9a0_2ee9f0f0ad414ce08cd1247fa3a1ab1e.pdf
    • https://cdn.shopify.com/s/files/1/0437/2371/8805/files/suvuvubekaguke.pdf
    • https://cdn.shopify.com/s/files/1/0437/1021/8391/files/free_battleship_games_for_android_phone.pdf
    • https://cdn.shopify.com/s/files/1/0463/3028/2145/files/lafabevis.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/phonic_worksheets_for_esl_students.pdf
    • https://cdn.shopify.com/s/files/1/0435/2452/2143/files/atresia_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.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_off0000712e.bin
ebe7f5fe689a7c117efe7ebe05753f6a6d735be44f45547f44fffe0420ab0c99
pdf-font-stream PDF embedded font (sfnt) at offset 0x712E 5436 bytes
font_01_sfnt_off000083b7.bin
470a628b341d5f7b3a3e36787a64c1cb595f4c1a090cab0bf56b2ebe2a175164
pdf-font-stream PDF embedded font (sfnt) at offset 0x83B7 9988 bytes