Malicious PDF — malware analysis report

Static analysis result for SHA-256 a393969da50c9c17…

MALICIOUS

PDF

33.1 KB Created: 2020-08-29 23:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cbaf3cb30a041b4e0544ed88c3e5917 SHA-1: ed840562232590f09f7d6d355b589c703896f621 SHA-256: a393969da50c9c170af39827143d916d42db1e7f62ea0dcf99226f85743fe282
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=libro+de+historia+tercer+grado+teles'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs. The document body, though heavily obfuscated, contains the same redirector URL and several other URLs that appear to be part of a link farm, some of which are hosted on static.usrfiles.com.

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/wix?keyword=libro+de+historia+tercer+grado+teles
    • https://static.usrfiles.com/ugd/b8c837_7f949fd4c32245dea35cfdcd393a6c3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d00d88f613e342daa10547b3680cecc8.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_cc2e4507428e4846aeee8afd127cc4e0.pdf
    • https://static.usrfiles.com/ugd/eaf48f_516851b66eef42c4adc33841c693f528.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0902/files/wuzoditufuja.pdf
    • https://cdn.shopify.com/s/files/1/0460/3143/7983/files/fogadatikolabip.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9760/files/26656048736.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/jazuvure.pdf
    • https://cdn.shopify.com/s/files/1/0440/6309/6984/files/9677110223.pdf
    • https://static.usrfiles.com/ugd/b8c837_23c7d0aeac2b4d37ba680e36ea7ee7b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c71c59435294bb49a24a87059cfecf8.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_off000042a9.bin
a7d5b9c5255bcf554660a4ea5bf8cb1ad4a4221dba318fe2e03da96f5dced7ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42A9 5280 bytes
font_01_sfnt_off00005491.bin
1956df42e0a15431f4b283c99e1a0282ad48c88ddef68039c755699f6d4d7e38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5491 10312 bytes

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