Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb906e90305f67e8…

MALICIOUS

PDF

38.7 KB Created: 2020-09-08 00:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b66a191afbc66c2b87d81f00669fbc0 SHA-1: dcdee7f29119d5902f0efada16fe30493928ad4c SHA-256: cb906e90305f67e873081836cddda2fce6abe445b7ccf0047570c7ae3a667500
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector URL (ttraff.me). This is indicative of a link farm or phishing attempt designed to direct users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=date+format+java
    • https://static.usrfiles.com/ugd/b8c837_5b0552f6909d4ddd9549ca0bf470489b.pdf
    • https://static.usrfiles.com/ugd/e8506d_512f513e4f2e442986bbb06638298277.pdf
    • https://static.usrfiles.com/ugd/432b07_d0475ced47a94f81b9dd408d3d60e396.pdf
    • https://static.usrfiles.com/ugd/35e1ce_e44d0a83326a43e7a7d8243960da642f.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bf50ae1afd24b6fb38718fd7279e402.pdf
    • https://static.usrfiles.com/ugd/5a1791_367c0584760247958224701630a48a97.pdf
    • https://static.usrfiles.com/ugd/69a512_11dc2b8339d04fb6a348cc2b8c3a684f.pdf
    • https://cdn.shopify.com/s/files/1/0457/5032/1308/files/ispa_conference_2018.pdf
    • https://cdn.shopify.com/s/files/1/0440/7204/2661/files/5682213403.pdf
    • https://cdn.shopify.com/s/files/1/0432/1135/8372/files/relomot.pdf
    • https://cdn.shopify.com/s/files/1/0429/3787/6639/files/powonizu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5770/8193/files/72358617389.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_off00005c87.bin
2c175209cc0f6ab930be3dbf6cfbf06c9e23096cf63070ca26d035b0e0b48119		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C87 4840 bytes
font_01_sfnt_off00006cf9.bin
6ee3cd65df29e7d5d176fe029370ec3bc15c1e21da621d18c990f5acdd1713b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF9 9756 bytes

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