Malicious PDF — malware analysis report

Static analysis result for SHA-256 48de04a109f53ced…

MALICIOUS

PDF

68.5 KB Created: 2020-08-30 11:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f0aafd534c37aaefc66a1636b806e21 SHA-1: b19f486be99426a7a2ed334c7516486fdc050c04 SHA-256: 48de04a109f53cedc3438046289e8f3fd783122f27a348525d5562e159e229b0
152 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, including one pointing to a known malicious redirector at `https://ttraff.ru/wix?keyword=bella+thorne+new+nudes`. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same lure text and URL, suggesting the primary purpose is to drive traffic to malicious sites.

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.ru/wix?keyword=bella+thorne+new+nudes
    • https://static.usrfiles.com/ugd/0df15e_47c99e09ea8e44d69e24d09ff2560c08.pdf
    • https://static.usrfiles.com/ugd/b8c837_685805a2e6f94bc3a55f425cf588e642.pdf
    • https://static.usrfiles.com/ugd/b8c837_784ab9ff4f1f49e38983d04f34a910e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_2960546235ce4e9bae43f3b01dee8232.pdf
    • https://static.usrfiles.com/ugd/cafc24_1ba23c2552664af482785491d8f92f58.pdf
    • https://cdn.shopify.com/s/files/1/0435/5204/7272/files/tv_guide_ireland_rte.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_51f1977eaee447be85cca71f4bead8df.pdf
    • https://static.usrfiles.com/ugd/09273f_655777348a5543d2a4e2c0bbf16e2078.pdf
    • https://static.usrfiles.com/ugd/a18aa6_2740213a3307413a9c3f24989a557602.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f726ef6f4fc4e1ab773155ee955dfe2.pdf
    • https://static.usrfiles.com/ugd/c0b427_af1739c1d013488880c26989744cf861.pdf
    • https://static.usrfiles.com/ugd/6cf392_d7db0311c13f42c29dbf04dca706bca2.pdf
    • https://static.usrfiles.com/ugd/b8c837_cea0e7fddef34c329f71ace3b7fb39fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_24a2109d6d6a4ef2a82f3fb2642d547c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b658.bin
2702c9d56613aabc27dcb6872497ba0d0f53788ff6f0dd9848ed45c245785396
pdf-font-stream PDF embedded font (sfnt) at offset 0xB658 4888 bytes
font_01_sfnt_off0000c6fa.bin
18e3dc16fd26b7f0482d2e8dc9d6c71742b0b8af3667b2c5612d9c1ad86a7a66
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FA 14700 bytes
font_02_sfnt_off0000f507.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 4324 bytes