Malicious PDF — malware analysis report

Static analysis result for SHA-256 90438397c21bb6e4…

MALICIOUS

PDF

44.4 KB Created: 2020-08-29 09:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23cd06e0d0f301e376771f9132beda73 SHA-1: 6c32345117bdba801c1e6b89a2a292e872d91488 SHA-256: 90438397c21bb6e40800525f6136bc10d7af0eb56417c41e9e21cddb29942d12
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=text+features+scavenger+hunt+5th+gra'. This URL is likely used to redirect users to a malicious site. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com'. The ML classifier strongly flagged this PDF as malicious. The presence of these elements suggests a social engineering attempt to direct users to harmful content.

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=text+features+scavenger+hunt+5th+gra
    • https://static.usrfiles.com/ugd/b8c837_b8813a76683e41758b0793fc6c1a0021.pdf
    • https://static.usrfiles.com/ugd/b8c837_394a5068d7e449e1b1c9c88527e82da4.pdf
    • https://static.usrfiles.com/ugd/b8c837_41934b2beee5442ca25610b90fd6c930.pdf
    • https://static.usrfiles.com/ugd/b8c837_d46e7e9ee5fb434b9fd3cfe864469dde.pdf
    • https://static.usrfiles.com/ugd/b8c837_16479d6eafdc437fa583bb2210179fda.pdf
    • https://static.usrfiles.com/ugd/b8c837_36865808e3de48bf84b4df5d9636c6a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_76fc61190625422d836c60101f99e96c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3b7170ea93f486198b35239bbecb89d.pdf
    • https://static.usrfiles.com/ugd/b8c837_09e163782efa4afaade876bacddeddee.pdf
    • https://static.usrfiles.com/ugd/b8c837_a25d2ea2402347baa32c25210f26d2f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_1467244157de43c9b0e9d60ba7ad47f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_13a468482e48450dbbfc3fc476ab9681.pdf
    • https://static.usrfiles.com/ugd/b8c837_035a758a74d84b788bc3ace722448051.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e5da1b3069347dd8e0e2853f2914e38.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca40a1fc49a2463e946423faa3ff8284.pdf
    • https://static.usrfiles.com/ugd/b8c837_6159d536557e434eb7e86a7a14553414.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_off000062f6.bin
716d9c1259d39a649aa471a1e88729fe8b4cecb160e13ac129a101bb1f2138b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F6 5036 bytes
font_01_sfnt_off00007417.bin
7fb42d49f7c96a8bf8e0f318af6e9afc9d849cbbc6129eec46ac7db8aa5d0c97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7417 10068 bytes
font_02_sfnt_off0000968e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x968E 4324 bytes

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