Malicious PDF — malware analysis report

Static analysis result for SHA-256 3437b3fed7e5d7e3…

MALICIOUS

PDF

36.4 KB Created: 2020-08-31 13:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e91a3cfbff8e9498b93537a5aca18a7 SHA-1: 60e2b4a66aaa34061820e1f39426559fcbfd72c4 SHA-256: 3437b3fed7e5d7e396e578413e7ee49103a362fa4b9bcce7259ec28e90e1698b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO manipulation or to hide malicious destinations. One prominent URL, 'https://ttraff.cc/wix?keyword=betty+crocker+cookbook+1969+paperback', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the redirector URL and numerous other PDF links.

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=betty+crocker+cookbook+1969+paperback
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_0c48052946144b0ab0da24408f636f6e.pdf
    • https://static.usrfiles.com/ugd/89064d_59c396472d5449d3b5dcfbcd58b5d0d7.pdf
    • https://static.usrfiles.com/ugd/5be868_ad8feeab7652434f8a6590b1f09f360e.pdf
    • https://static.usrfiles.com/ugd/911c12_9ed914b775ec420cb50d2325733341de.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1578dece73340fc9d5ec14cd4dca690.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/tezosi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3448/3616/files/alain_touraine_critica_de_la_modernidad_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6070/files/brainstem_auditory_evoked_response.pdf
    • https://cdn.shopify.com/s/files/1/0463/2379/4077/files/way_back_home_flute_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0433/6461/4303/files/49017956471.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/candlestick_patterns_meanings.pdf
    • https://cdn.shopify.com/s/files/1/0435/5185/0647/files/dc_self_insert_fanfiction.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5562/files/abhijit_banerjee_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/2666/7925/files/95649347622.pdf
    • https://cdn.shopify.com/s/files/1/0435/0358/3384/files/tutodadugidodedevigar.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043ec.bin
2de31ba5040c4426409a8e832323dddf3bd2ad50c97a443f55d80f900f81a6e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43EC 5068 bytes
font_01_sfnt_off0000553f.bin
92801b8fe58f15dba7c7a66fb709460a416515e98389b3eba622514674531754		 pdf-font-stream PDF embedded font (sfnt) at offset 0x553F 9796 bytes
font_02_sfnt_off000076da.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DA 4324 bytes

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