Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c275fabae74bbe…

MALICIOUS

PDF

36.5 KB Created: 2020-08-30 09:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9e54b548fdb411dbad29ed8a4c6dd84 SHA-1: b09dc69e65bf4c39922fa077c98a13c87da2abee SHA-256: 24c275fabae74bbe9761d8df34808662724d74830604d060c8a06fd5828495da
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=geometry+dash+1.+93+apk'. The document body also contains this URL and references 'Geometry dash 1.93 apk', suggesting a lure to trick users into clicking the malicious link. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to static.usrfiles.com.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/wix?keyword=geometry+dash+1.+93+apk
    • https://static.usrfiles.com/ugd/b8c837_4bc0c6f527d74564a636a529e350350f.pdf
    • https://static.usrfiles.com/ugd/ab922d_7a442d3f93a5404ab49e4329fd71ec61.pdf
    • https://static.usrfiles.com/ugd/7603ae_d2dbbbed261148639b79a9bdd660ced1.pdf
    • https://static.usrfiles.com/ugd/b8c837_e334b50ff0814d4296a42551ef71dad4.pdf
    • https://static.usrfiles.com/ugd/b98abb_cdebd8ef98494588a431ef244d2cdbb3.pdf
    • https://cdn.shopify.com/s/files/1/0436/0352/5790/files/28089603961.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/localized_and_delocalized_bonding_in_organic_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0463/5177/7954/files/phone_call_recording_app_android_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/7260/0726/files/indoor_team_building_games_for_employees.pdf
    • https://static.usrfiles.com/ugd/c0b427_836084a6248f43d1abbbda610a5dbed5.pdf
    • https://static.usrfiles.com/ugd/9c43ec_36ebef96e8a24321b7b7524538c7465d.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9269d17b71a4edd87cb2a3594e3f91f.pdf
    • https://static.usrfiles.com/ugd/9e53d4_d86a0898ad4342cc89d1f2b7b73d3bda.pdf
    • https://static.usrfiles.com/ugd/b8c837_ff99d61fcb7346d69b9b03948866c7bd.pdf
    • https://static.usrfiles.com/ugd/565485_10fee8fbf364414c9a730466a28b1bcd.pdf
    • https://static.usrfiles.com/ugd/9dda13_52432cba52e646728fc63bfb7893daf6.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_off00004d47.bin
1827e443a222898645bf8e48a0972b4383f7fabf197bf4a263b6c20d3e1f5be8
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D47 5768 bytes
font_01_sfnt_off000060e2.bin
09ada1d80a2ec56bba669254c26952b499287b81256975601f3044afcf7a34f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x60E2 10664 bytes