Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dfb75c5662e9e12…

MALICIOUS

PDF

40.4 KB Created: 2020-08-31 21:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0913e3200fbf9432a6f0f8b5c77a61be SHA-1: ff7ede9e7bf8a33a5f12d6c0874599e636db5fe5 SHA-256: 2dfb75c5662e9e12fe88f7d15e764e628be8aa23b8d60e5d879ce335ed4296b1
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.com/wix?keyword=cheaters+app+for+android', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous other links to 'static.usrfiles.com' further supports the link farm attack pattern.

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.com/wix?keyword=cheaters+app+for+android
    • https://static.usrfiles.com/ugd/b8c837_e66e3cbda4704ce7a37e32087281caf9.pdf
    • https://static.usrfiles.com/ugd/b8c837_48678c07c83842769f636ebcdd7e76a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_04b691418b70453aa3f836a0939145b7.pdf
    • https://static.usrfiles.com/ugd/4725f1_4b4ae5e5e7b74326abee05053c0f96b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0cc35da997b468d853716e3767e0952.pdf
    • https://static.usrfiles.com/ugd/6116da_7d2c2bc270474cb7adbc43cf3565ffa5.pdf
    • https://static.usrfiles.com/ugd/b8c837_47a6162826154e11a013bc4bea100920.pdf
    • https://static.usrfiles.com/ugd/63d3ad_16548c54ea0143039499a491a95af63e.pdf
    • https://static.usrfiles.com/ugd/b88e3d_82398d2e1061416abf244a0c51a0145b.pdf
    • https://static.usrfiles.com/ugd/b56239_707caa7a5b864d9b96eb773e3f74c8ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1a0654b70ed4c788273c6c4335679f8.pdf
    • https://cdn.shopify.com/s/files/1/0430/2084/5210/files/6657793638.pdf
    • https://cdn.shopify.com/s/files/1/0435/5037/6100/files/25489177748.pdf
    • https://cdn.shopify.com/s/files/1/0427/6187/9719/files/air_pollution_control_a_design_approach_free_download.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_off00006226.bin
a65315d9b2d2199caebd4df12e591029f59dd03811f23109d65bf11bfe2bcbcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6226 5004 bytes
font_01_sfnt_off0000731b.bin
97aeb504ecd1732d99ae74689565d57c5ccce73711c1a057bf4e74163978bc79
pdf-font-stream PDF embedded font (sfnt) at offset 0x731B 9956 bytes