Malicious PDF — malware analysis report

Static analysis result for SHA-256 63aea8fc10bb1b39…

MALICIOUS

PDF

48.6 KB Created: 2020-08-30 15:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 617dcccb7c9bd4ba569882a83ac11573 SHA-1: dc81fcd82795163588b1aa5e26305f7a0740795c SHA-256: 63aea8fc10bb1b39757b86531ba4f3bae03ba1da51824b07d54cb89d25c0f712
162 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for 'free printable worksheets', and the primary URL points to a redirector designed to serve SEO spam. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=first+grade+counting+money+worksheets+free+printable
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/jepodakagefukixuremek.pdf
    • https://cdn.shopify.com/s/files/1/0431/8930/5506/files/zikiwufagijelejetagi.pdf
    • https://cdn.shopify.com/s/files/1/0438/5187/4466/files/jevoru.pdf
    • https://cdn.shopify.com/s/files/1/0431/4873/8720/files/50132304613.pdf
    • https://static.usrfiles.com/ugd/b8c837_2573a8ca49564f4794e99fd2e96a94be.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_f7042735d15b40b1b693b1970df7c77e.pdf
    • https://static.usrfiles.com/ugd/b8c837_56c778c42d384d11aaec11678f32ac8f.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_dca6f344f8c6489a8fc4e026a88bea00.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1774ddf6d114eb98cce210ceae72023.pdf
    • https://static.usrfiles.com/ugd/73c254_d4a7f39026bb447888d6fefffc98c4a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_d73749051f7d4100bd8489917850ba5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_88492bafbfee4ccebaf47e4fe01bd625.pdf
    • https://static.usrfiles.com/ugd/314c35_71847fbe8fe54fbfa7660fca8b74d43c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e42cdb94b4f42a59ed19e4959f5f94d.pdf
    • https://static.usrfiles.com/ugd/0a052f_5b77caf401604c468e76332ca37a1e64.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ebb.bin
e4e73c6c3af9d729f521044948463c1537f1f4264b436e33cfe4445160942597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBB 5920 bytes
font_01_sfnt_off000072c6.bin
8ba9c52a22a0bd458c57ab170045b9423d7216271940a9474b0598cf861242aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C6 11832 bytes
font_02_sfnt_off00009940.bin
75aa48e6826f3f590d7c7862744425d7aed44e3aea336bf96a4c9c48b5a6ade2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9940 17276 bytes

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