Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f3e8910ffecf5d…

MALICIOUS

PDF

58.7 KB Created: 2020-09-01 07:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8f0d9c43f23f22194d95e38f7d8c18d SHA-1: 76acb7c29a3390afe861fc5fb56fe8d70737cf7a SHA-256: 11f3e8910ffecf5d33510a0a7ead34c983fb186c4c46838eda1a21e3359f37fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains a URL that aligns with this finding. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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.com/wix?keyword=chemistry+equations+balancing+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0460/3766/3903/files/bam_bam_bole_movie_hd.pdf
    • https://cdn.shopify.com/s/files/1/0431/9975/8497/files/spreadsheet_nightmare_meme.pdf
    • https://cdn.shopify.com/s/files/1/0438/3437/6352/files/cds_2_2020_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/3398/4162/files/dogebosasuwawuwamawanog.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/2363099376.pdf
    • https://static.usrfiles.com/ugd/48f461_1c827fe7db564fef873890607358671c.pdf
    • https://static.usrfiles.com/ugd/9ea91e_6bdc7e01189b4b95b64267c2a7b455d8.pdf
    • https://static.usrfiles.com/ugd/930050_333d65fa7ad8458ba8e91dea2ea6d19a.pdf
    • https://static.usrfiles.com/ugd/83d902_6c1e28df913046bbbaa9fb4ab32c3271.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/93012164574.pdf
    • https://cdn.shopify.com/s/files/1/0437/0920/2597/files/18771054178.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/dadina.pdf
    • https://cdn.shopify.com/s/files/1/0434/9558/8002/files/la_quimica_del_cemento_portland.pdf
    • https://static.usrfiles.com/ugd/8b2c09_4ca234aa7c5b4a26b0d30dd01e16548c.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbd8abcb46b74c278e131be0b1abfa6e.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_off00009b5c.bin
3b89a1333aa93e194de12c5c5da229a8f3a969ace6b07a90c5323b9ece6747ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B5C 2828 bytes
font_01_sfnt_off0000a557.bin
74ebe5498581a329273569c106fb3265c00deb6a00a90f1b03155b6020a14cde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA557 5644 bytes
font_02_sfnt_off0000b871.bin
96ed7b10e76fde32c2208307954f46b59d6627c35a567beeba575f48bbd7eb1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB871 10216 bytes

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