Malicious PDF — malware analysis report

Static analysis result for SHA-256 c599ce26b4f36aa8…

MALICIOUS

PDF

42.8 KB Created: 2020-09-12 02:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebbe879452281fc6ff31d804140fc9e7 SHA-1: 5bf3355cc50d2072e672d834988a9fd1471e8088 SHA-256: c599ce26b4f36aa8c4e18d49519a62d444dbdddd611c3d549761119736c4a682
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting an SEO poisoning attempt. One prominent link, 'https://ttraff.club/wix?keyword=vocabulary+worksheets+5th+grade', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URLs, reinforcing the 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.club/wix?keyword=vocabulary+worksheets+5th+grade
    • http://sifetel.seth-dobbs.com/uploads/1/3/1/8/131871768/logimafisomusaj_rupivamerifa_zazatosari_paxajorudanut.pdf
    • http://lapop.xclusive-footwear.com/uploads/1/3/1/3/131378942/zepabujazu.pdf
    • http://fiwobolav.barryshlachter.net/uploads/1/3/2/3/132302978/botixal.pdf
    • http://files.azzurrawebart.com/uploads/1/3/1/6/131606984/1474199.pdf
    • http://rixujavab.kupr.org/uploads/1/3/0/7/130776225/1198796.pdf
    • https://cdn.shopify.com/s/files/1/0441/4016/7320/files/cities_skylines_industry_traffic_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/3759/7607/files/2018_calendar_canada_printable.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/bruce_lee_workout_plan.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/59910930428.pdf
    • https://static.usrfiles.com/ugd/a467d2_c3163f9ebd2945f2883530dd7359f5ad.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_d74f2af2a1f0462fba22e2036ebe4979.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a9b832ce99c473fb8a95568f8a7f68f.pdf
    • https://cdn.shopify.com/s/files/1/0432/6113/2968/files/luvugolutorusimon.pdf
    • https://cdn.shopify.com/s/files/1/0435/3507/3448/files/nalgene_warranty_information.pdf
    • https://cdn.shopify.com/s/files/1/0445/3515/2804/files/8221882101.pdf
    • https://cdn.shopify.com/s/files/1/0433/9564/5589/files/xekubewinavifilorik.pdf
    • https://cdn.shopify.com/s/files/1/0435/8914/0643/files/casio_se-_5800_manual.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_off00006872.bin
a94399da8afb8bc8c89cef988caad02530efdce9efb434ce74820af16fe674f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6872 5688 bytes
font_01_sfnt_off00007be0.bin
3560b99b5cfdeb341c9328f4905ed4b6dd2ecff78cac7533c124a5eaac530d7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE0 10084 bytes

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