Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6a532a59bd8493…

MALICIOUS

PDF

43.7 KB Created: 2020-08-31 19:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b411b9e816f0bf011f2042d2018c3c52 SHA-1: 472658e696744827ed9073efdf0ea4d5148657fc SHA-256: ac6a532a59bd84933f36c58b7f99ed8b9cc1e35be93c9e57b631f58fd20a6406
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used to create link farms for SEO manipulation or to host malicious redirects. One of the primary URLs, 'https://ttraff.com/pify?keyword=beresheet+earth+selfie', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to this malicious URL and other URLs hosted on 'static.usrfiles.com', which are part of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=beresheet+earth+selfie
    • https://static.usrfiles.com/ugd/ea5d7b_de20aa11d4da4318ac2629e3fd0c6b52.pdf
    • https://static.usrfiles.com/ugd/63d3ad_8d8a61ea2b2c4e51acc7657356f04491.pdf
    • https://static.usrfiles.com/ugd/af0aa9_5092f4ced4fd4307aa90008542fb54b9.pdf
    • https://static.usrfiles.com/ugd/1813b3_8508751317134d6e947de0de52b07e7b.pdf
    • https://static.usrfiles.com/ugd/af0aa9_3ef5733a3a94465781d7fbac8de3d945.pdf
    • https://static.usrfiles.com/ugd/df73ab_83977c736fa0427485737b75c1292058.pdf
    • https://static.usrfiles.com/ugd/b8c837_1af16ffb28e6454c916cbb9a6fc20157.pdf
    • https://static.usrfiles.com/ugd/b8c837_a32b667547324476903e0ce391f8835c.pdf
    • https://static.usrfiles.com/ugd/b8c837_40232448f3514cf596feb2af6b0549d4.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/79329546659.pdf
    • https://cdn.shopify.com/s/files/1/0428/6060/9692/files/vemamukux.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_off00006018.bin
c894a52a4c6ba8fc16142f7019ec2b4a627f140f45ec40b4aa80105df5d503d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6018 4476 bytes
font_01_sfnt_off00006f53.bin
e757e420d4ce27938ae56575ecfd9de3956a7a5ff5772d5e95c1de461f4b5031		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F53 10852 bytes
font_02_sfnt_off0000944a.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x944A 4324 bytes

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