Malicious PDF — malware analysis report

Static analysis result for SHA-256 2edebc34b6ab751a…

MALICIOUS

PDF

33.7 KB Created: 2020-09-01 05:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f55a945d1a5a9e9e403bf0cd60073c5d SHA-1: c732d2aab7a57cfaf68436b57d3fae20c03a4b25 SHA-256: 2edebc34b6ab751afa3917fb8b4f2570a86c0117cb639e10f8201b758b09c6a8
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document body and embedded URLs suggest a lure to a song-related page, which then redirects to the malicious infrastructure. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=aao+na+song++webmusic
    • https://static.usrfiles.com/ugd/08fe48_4fb1e0f32e344fa0b4b08b6afaf1d314.pdf
    • https://static.usrfiles.com/ugd/db1da1_5504185f25cf4ab69ae2c4da0a214542.pdf
    • https://static.usrfiles.com/ugd/18f527_0fc368adc14f436eb40dbb0a764fa1d5.pdf
    • https://cdn.shopify.com/s/files/1/0436/4104/5145/files/julajetofofu.pdf
    • https://static.usrfiles.com/ugd/ae15ca_a7fad2df3fbe4ab3b27bd738b1e0fec4.pdf
    • https://static.usrfiles.com/ugd/2e16aa_9ea10a6a5cec4c6c9fdf33a5fe2ce76d.pdf
    • https://static.usrfiles.com/ugd/912de2_eadea6e05eda4dbea66bcffdac655e17.pdf
    • https://static.usrfiles.com/ugd/e73fea_6d917d3f93034d54834f4302160589b0.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_off00004645.bin
4b5a88bb746894f4255ce6904024d374fa91d7964ec31d7544d58c9477e41f7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4645 5212 bytes
font_01_sfnt_off0000580a.bin
ad97f2ef6b2691274819cbe1e28ec3b565f968263129270ead037bb2e487143f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x580A 10212 bytes

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