Malicious PDF — malware analysis report

Static analysis result for SHA-256 2838429f07f0e8c0…

MALICIOUS

PDF

40.2 KB Created: 2020-09-02 13:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a53ec333eb233490cdfd36a0e0976792 SHA-1: bda055fb8a0339bcac2af71529083d0554c388e5 SHA-256: 2838429f07f0e8c0bfd71a5f26ba92c7741e4e9f8b7a841fbfe3086fe28ab58d
150 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.me, which is disguised as a search result for song lyrics. The document body, though partially corrupted, contains the search query, indicating the lure. The presence of numerous external links, many pointing to static.usrfiles.com, suggests a link farm designed to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=kathaigalai+pesum+song++masstamilan
    • https://static.usrfiles.com/ugd/d99ef3_d1dc792bafb547c4990cba8a8821b90f.pdf
    • https://static.usrfiles.com/ugd/345929_46535c5481824071a825d3e874f02623.pdf
    • https://static.usrfiles.com/ugd/ce14f3_abaaf92dad084aedaa7767e2cc2e4d48.pdf
    • https://static.usrfiles.com/ugd/c63bf9_ff0d7cd2f2ef4a8d8d7bfe8210718676.pdf
    • https://static.usrfiles.com/ugd/3fb742_8b622036ece84586a1eeac3b1ae65597.pdf
    • https://static.usrfiles.com/ugd/6f58fb_04efe6d95e1f420a83de89a6cec9b8e2.pdf
    • https://static.usrfiles.com/ugd/ea78e0_696cf9d69fc840b7940ac9f62a242a13.pdf
    • https://static.usrfiles.com/ugd/856cea_930f3864672b46b4a51d025a9c033a6b.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/23651664874.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8234/files/wevovemanebezosobi.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_off000056eb.bin
be189bcafd374813ffd6454347242693a687c8222a06ea8b02e9cd3a14251b08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56EB 5104 bytes
font_01_sfnt_off00006832.bin
219149447d9e6e177218c4f3b477c016faf78ff0068facd0dc53b7bfed5abae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6832 13740 bytes

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