Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca9e608adf9d6b4…

MALICIOUS

PDF

47.5 KB Created: 2020-09-05 14:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 21c351aa18b46e4c826ff126b7535fe5 SHA-1: bcef53ba53236d76adf2744bb810e2bc5c01e7bf SHA-256: fca9e608adf9d6b4894571fcebcde65db00a0725963788cda2f273d72ca78781
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, identified as a link farm, with one critical redirector link pointing to a suspicious URL. The document body, though heavily obfuscated, contains the same suspicious URL, suggesting an attempt to trick users into visiting a malicious site under the guise of providing educational worksheets.

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.ru/wix?keyword=free+halloween+math+worksheets+grade+3 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/63437287189.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/jadegutafob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8674/0646/files/aeronautica_imperialis_2020.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/078c79_498743439fc34ba7bb28629704af52e8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9c43ec_87034adc425441b697edce4791b8c5f9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d3758e_327a70f544fb49b2837942eb7ef0f1bc.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b88e3d_a8599e96a5f64fd2bb9adfbd3b0082ba.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e481ce_a58c99101d3b4fe5a91498de005acc02.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3462/4679/files/95557684623.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2313/0009/files/kajofanikumopikoga.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cc15ef_f2cb9cc5c2f8490b8bf536b7ea2f3a07.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e0d0cf_69a57d0f586f4cf29eda5b4755519d22.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3aca14_4adbfeafe40249848a64177b87cf5ef0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/04e6f9_10203a324c4140d795f8a9d20b8a7d67.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ae059d_6248a82455da41c19656644d33b07f60.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2F 5256 bytes
SHA-256: b3049007b1040efacabb155f770bcbf394d8f872c5a76d086584f3fb1f5dc466
font_01_sfnt_off00007ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF2 10220 bytes
SHA-256: 2e3c48ad2bd519466ce7f9e90bf5df569f461d078bb8b5242ebb1fb839a07109
font_02_sfnt_off0000a2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2EF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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