Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cd79eaa72c1ddc…

MALICIOUS

PDF

40.2 KB Created: 2020-08-31 08:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8461ca59cea8767d1e67664561bf7c9 SHA-1: 22bab8f961eb3a0319a319b9b68503e41532d977 SHA-256: 41cd79eaa72c1ddcbf6682d1903bf54c3531c8a357bc59c29ed822bb6ae46206
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.cc/wix?keyword=dr+york+hattiesburg+ms as malicious. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=dr+york+hattiesburg+ms
    • https://static.usrfiles.com/ugd/158fb9_2bf8b2deaa25457e95a36e9be6cf448f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d70c5c6f37024ce0901cfea14c0efcb7.pdf
    • https://static.usrfiles.com/ugd/b56239_1c57b7ea8fa54b86b80b0aab530b8848.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/xijorek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/minirefotapobizezuloxot.pdf
    • https://cdn.shopify.com/s/files/1/0445/6490/6148/files/maths_formulas_for_class_6_to_8.pdf
    • https://static.usrfiles.com/ugd/defcb2_32f0cc0410ec4c4f89e8a3d53a0ea6cb.pdf
    • https://static.usrfiles.com/ugd/868401_a864a3cf643a400b908621484d500f08.pdf
    • https://static.usrfiles.com/ugd/516793_8f67163800f04f0eadb05c5f6211e800.pdf
    • https://static.usrfiles.com/ugd/36f25b_02b0b6ddfe504749ba4fcc8229b2a2a4.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b33.bin
b972500656a6d9076ec4f7b5ace15e7161353f90b9c54f175d761484bb0a438b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B33 5372 bytes
font_01_sfnt_off00006d63.bin
33dd829aa0ea53b285ee52b52b1f9d5f82a1a99cad1efa387fb7f8dbcff4b3af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D63 12080 bytes

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