Malicious PDF — malware analysis report

Static analysis result for SHA-256 befe5e98ef11b990…

MALICIOUS

PDF

39.2 KB Created: 2020-08-31 05:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ede7f8db11193256b5fc46270557e21e SHA-1: 6fa3907009bd2f52db9d34ac8807f43c32c0e753 SHA-256: befe5e98ef11b9904dd25dcff4542d983c3d03ad09470cf6dbb6954e833e56e2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised with a keyword related to purchasing and supply chain management. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated but contains the malicious URL. The presence of multiple links to external PDFs suggests a link farm or redirection strategy.

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=purchasing+and+supply+chain+manageme
    • https://static.usrfiles.com/ugd/99a8f2_232730865ed3428c92875f2405e48cbb.pdf
    • https://static.usrfiles.com/ugd/f46427_aca54aa76eef49f7a34aa4fd4c89ec18.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed7bf30f950c41f3bdd21cc6a1e732bc.pdf
    • https://cdn.shopify.com/s/files/1/0433/9059/9319/files/apple_audiobook.pdf
    • https://static.usrfiles.com/ugd/b8c837_e152ae9b6e3b4857980a9bbd5936e161.pdf
    • https://static.usrfiles.com/ugd/f63f29_e7a2a5a7caf34310b065d6509206620f.pdf
    • https://static.usrfiles.com/ugd/0d089b_479f3561fcc84a6fba3e296b7e268f47.pdf
    • https://static.usrfiles.com/ugd/8dde66_a7fa0f4550ba4483a332726e0258738e.pdf
    • https://static.usrfiles.com/ugd/111c46_9192ed3048d445319980754a7a0b706b.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_off00005c6d.bin
a6e50b837d016a49ec6a11aa5ab00c1864722114768a995bf9c462bb78326f05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6D 5588 bytes
font_01_sfnt_off00006f41.bin
98a356ebb6b25ab7e2bb26810832ebc7c1f38a8f8430227cb0cfec4804412630		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F41 9800 bytes

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