Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e27102699dd8db…

MALICIOUS

PDF

45.6 KB Created: 2020-08-30 03:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e84f7c367fa3ed9bfc8cb09b6541bc52 SHA-1: 6f5d12ee7b1de725d542dbb3d0cedb7c8b57c428 SHA-256: 55e27102699dd8dbc5d8efd8fd16d2f4e93b12581bff3e543bbbbd2d092ceb8c
154 Risk Score

Malware Insights

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

This PDF file contains a malicious redirector link disguised as a search query. The primary heuristic indicates a PDF malicious redirector link pointing to 'ttraff.cc'. Additionally, the file exhibits characteristics of a PDF SEO link farm, with numerous external links, suggesting an attempt to drive traffic to various sites. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector URL is sufficient evidence of malicious intent.

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.cc/wix?keyword=contacter+sfr+par+mail+sans+etre+client
    • https://static.usrfiles.com/ugd/ca9b0a_7670f4a4a7a640448786c5942178426c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3297023679d549498317115d8b4c9a26.pdf
    • https://static.usrfiles.com/ugd/b8c837_947bb5f389fb4debabc2e21b2e1a5749.pdf
    • https://static.usrfiles.com/ugd/b8c837_428cec0b543d4fd7a34cd88414831e33.pdf
    • https://static.usrfiles.com/ugd/b8c837_5df9caff6de54f7495ebebf00a58924b.pdf
    • https://static.usrfiles.com/ugd/b8c837_92643ab8a8d8469095dfdf546edb9ea5.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce8485c771254e16b8da408b3e5501c1.pdf
    • https://static.usrfiles.com/ugd/d2751c_180711ea619444698a522c5c3512fe20.pdf
    • https://static.usrfiles.com/ugd/80c1db_8e0eca6cecea4dc7a32446b61406aa96.pdf
    • https://static.usrfiles.com/ugd/e6092c_f105d759818b40ed93bc3037738491fc.pdf
    • https://static.usrfiles.com/ugd/23e9be_4fe2c8e063e64c9785f607cb6331ee3e.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0357/files/kepadoxivufasaxanot.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/2095006312.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/zebuji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9809/6284/files/acknowledgement_research_sample.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_off000063f0.bin
7f3c9a4c8a3b96068dccffcd62d99362b75e694d0644aae2d14f526ca217920d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F0 4972 bytes
font_01_sfnt_off000074b2.bin
27941548cb01235bf264a462be0fd4155a7654fbfc0340d0aed9a823782b4742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B2 11736 bytes
font_02_sfnt_off00009978.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9978 4324 bytes

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