Malicious PDF — malware analysis report

Static analysis result for SHA-256 041d8e80c357d985…

MALICIOUS

PDF

48.2 KB Created: 2020-08-31 03:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec4b527f8a38c86cc9b853c19fcf3c6 SHA-1: 89f3fbfe6d65f3c505ab0db152c4d79054ab109e SHA-256: 041d8e80c357d9851502f9267e3ae7cd344d31f050dc45fbc90eab75305d8774
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=c%25C3%25B4+c%25E1%25BA%25A1n+dung+d%25E1%25BB%258Bch+thu+%25C4%2591%25C6%25B0%25E1%25BB%25A3c+mu%25E1%25BB%2591i+khan'. Additionally, it exhibits characteristics of a PDF link farm with numerous external links, many of which are to benign Shopify domains. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood 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.ru/wix?keyword=c%25C3%25B4+c%25E1%25BA%25A1n+dung+d%25E1%25BB%258Bch+thu+%25C4%2591%25C6%25B0%25E1%25BB%25A3c+mu%25E1%25BB%2591i+khan
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6365/4040/files/carbon_nanotubes_abstract.pdf
    • https://cdn.shopify.com/s/files/1/0436/9291/6891/files/11359036327.pdf
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/porab.pdf
    • https://static.usrfiles.com/ugd/b8c837_3776a5ddc8e743ee883cc026ff267536.pdf
    • https://static.usrfiles.com/ugd/739437_e57731d4ec4348c9b117bfeb73234344.pdf
    • https://static.usrfiles.com/ugd/5af86b_2e4beafd05414ec2b5f8df1d61293821.pdf
    • https://static.usrfiles.com/ugd/b8c837_8432177643f44956bbf81b136dba065b.pdf
    • https://static.usrfiles.com/ugd/26481d_1af0081dcf9c4e0bb24599e04f2cffa9.pdf
    • https://static.usrfiles.com/ugd/d01287_361bc2503604413197ea7dc0fae34ced.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_5702d2d0aaa54f14957b5e212e3c5b68.pdf
    • https://static.usrfiles.com/ugd/2c608b_66bdb80bf9084f739868dec463e92f1f.pdf
    • https://static.usrfiles.com/ugd/b80405_d766cc33e6734a51b93b7a47ed69cc8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4afe074db90c414882ada8697861c3ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_377c94258a5f403998d57114d9890b01.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066db.bin
4b1d849d6dabcda914cf24ceddffa905db73ff8634f971d0a99fb3b5793baa4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66DB 6056 bytes
font_01_sfnt_off000079c5.bin
d3d4096954d9b768b130ed5a53c2fd2fb16c361496da1da864e0d4786abe5d3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C5 24736 bytes

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