Malicious PDF — malware analysis report

Static analysis result for SHA-256 a645d52cc500b87a…

MALICIOUS

PDF

36.3 KB Created: 2020-08-29 09:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 772a4b4bee4cf483f7577c7eb3171a92 SHA-1: 2c57eeb634a6e890acfee64e3610f386d53a36cd SHA-256: a645d52cc500b87a34c80d12c5ce7085172323d2763d314b9f6e9d6e3174f804
120 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.cc, which is disguised as a link to download educational worksheets. The document body, though heavily obfuscated, contains the URL and appears to be a lure. The presence of a mass external PDF link farm further indicates a malicious intent to distribute links to potentially harmful content.

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.cc/wix?keyword=decoding+multisyllabic+words+worksheets+pdf
    • https://static.usrfiles.com/ugd/b8c837_78dbe1cd54dd4775b663c00a45d464b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d08ac3d725a4921b691155fbd84b27f.pdf
    • https://static.usrfiles.com/ugd/b8c837_4820d587703c45f1bae3d88223922d31.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9917/files/sensory_evaluation_techniques_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/14706940843.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0c51820f48f492b9c12623f66e317ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_92a6cbb52b6147bfa79d947dc61c8ac9.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5159d6418e94aa29d2a13a5ee204029.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4cda6bd2d794ff4a1f776d213aa55d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d041b23e8f7473cb1a50ea01cf99e19.pdf
    • https://static.usrfiles.com/ugd/b8c837_0dd76032c2fb4879846c6c50cf3f39df.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_off00004d86.bin
30aa70f027a5474cf0556403e357de9bef83f57443b2d9c3c02a7ee05752b550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D86 5964 bytes
font_01_sfnt_off000061b4.bin
81e2d645ce2a2d6b37db3f98d92e168a69bbdfa3a144e0376e9a238fea8f3a8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B4 10272 bytes

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